Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.41.0 to 1.42.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/grpc/grpc-go/releases">google.golang.org/grpc's releases</a>.</em></p>
<blockquote>
<h2>Release 1.42.0</h2>
<h1>Behavior Changes</h1>
<ul>
<li>grpc: Dial(&quot;unix://relative-path&quot;) no longer works (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4817">#4817</a>)
<ul>
<li>use &quot;unix://absolute-path&quot; or &quot;unix:relative-path&quot; instead in accordance with <a href="https://github.com/grpc/grpc/blob/master/doc/naming.md#name-syntax">our documentation</a></li>
</ul>
</li>
<li>xds/csds: use new field <code>GenericXdsConfig</code> instead of <code>PerXdsConfig</code> (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4898">#4898</a>)</li>
</ul>
<h1>New Features</h1>
<ul>
<li>grpc: support <code>grpc.WithAuthority</code> when secure credentials are used (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4817">#4817</a>)</li>
<li>creds/google: add NewDefaultCredentialsWithOptions() to support custom per-RPC creds (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4830">#4830</a>)</li>
<li>authz: create file watcher interceptor for gRPC SDK API (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4760">#4760</a>)</li>
<li>attributes: add <code>Equal</code> method (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4855">#4855</a>)</li>
<li>resolver: add <code>AddressMap</code> and <code>State.BalancerAttributes</code> (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4855">#4855</a>)</li>
<li>resolver: Add <code>URL</code> field to <code>Target</code> to store parsed dial target (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4817">#4817</a>)</li>
<li>grpclb: add a <code>target_name</code> field to lb config to specify target when used as a child policy (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4847">#4847</a>)</li>
<li>grpclog: support formatting log output as JSON (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4854">#4854</a>)</li>
</ul>
<h1>Bug Fixes</h1>
<ul>
<li>server: add missing conn.Close if the connection dies before reading the HTTP/2 preface (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4837">#4837</a>)</li>
<li>grpclb: recover if addresses are received after an empty server list was received previously (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4879">#4879</a>)</li>
<li>authz: support empty principals and fix rbac authenticated matcher (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4883">#4883</a>)</li>
<li>xds/rds: NACK the RDS response if it contains unknown cluster specifier (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4788">#4788</a>)</li>
<li>xds/priority: do not switch to low priority when high priority is in Idle (e.g. ringhash) (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4889">#4889</a>)</li>
</ul>
<h1>Documentation</h1>
<ul>
<li>grpc: stabilize WithDefaultServiceConfig and improve godoc (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4888">#4888</a>)</li>
<li>status: clarify FromError docstring (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4880">#4880</a>)</li>
<li>examples: add example illustrating the use of unix abstract sockets (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4848">#4848</a>)</li>
<li>examples: update load balancing example to use loadBalancingConfig (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4887">#4887</a>)</li>
<li>doc: promote WithDisableRetry to stable; clarify retry is enabled by default (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4901">#4901</a>)</li>
</ul>
<h1>API Changes</h1>
<ul>
<li>credentials: Mark <code>TransportCredentials.OverrideServerName</code> method as deprecated (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4817">#4817</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="aff571cc86"><code>aff571c</code></a> Change version to 1.42.0 (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4910">#4910</a>)</li>
<li><a href="2d7bdf2d23"><code>2d7bdf2</code></a> xds: Set RBAC on by default (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4909">#4909</a>)</li>
<li><a href="d47437c91e"><code>d47437c</code></a> xds: Fix invert functionality for header matcher (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4902">#4902</a>)</li>
<li><a href="9fa2698264"><code>9fa2698</code></a> xds/csds: populate new GenericXdsConfig field (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4898">#4898</a>)</li>
<li><a href="6e8625df63"><code>6e8625d</code></a> doc: promote WithDisableRetry to stable; clarify retry is enabled by default ...</li>
<li><a href="f1d87c14c2"><code>f1d87c1</code></a> client: properly disable retry if GRPC_GO_RETRY=off (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4899">#4899</a>)</li>
<li><a href="03753f593c"><code>03753f5</code></a> creds/google: fix CFE cluster name check (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4893">#4893</a>)</li>
<li><a href="4f21cde702"><code>4f21cde</code></a> authz: support empty principals and fix rbac authenticated matcher (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4883">#4883</a>)</li>
<li><a href="f00baa6c3c"><code>f00baa6</code></a> resolver: replace AddressMap.Range with Keys (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4891">#4891</a>)</li>
<li><a href="2a312458e6"><code>2a31245</code></a> client: don't force passthrough as default resolver (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/4890">#4890</a>)</li>
<li>Additional commits viewable in <a href="https://github.com/grpc/grpc-go/compare/v1.41.0...v1.42.0">compare view</a></li>
</ul>
</details>
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</details>

Co-authored-by: Callum Waters <cmwaters19@gmail.com>
Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

The code in the Tendermint repository makes heavy use of import aliasing.
This is made necessary by our extensive reuse of common base package names, and
by repetition of similar names across different subdirectories.

Unfortunately we have not been very consistent about which packages we alias in
various circumstances, and the aliases we use vary. In the spirit of the advice
in the style guide and https://github.com/golang/go/wiki/CodeReviewComments#imports,
his change makes an effort to clean up and normalize import aliasing.

This change makes no API or behavioral changes. It is a pure cleanup intended
o help make the code more readable to developers (including myself) trying to
understand what is being imported where.

Only unexported names have been modified, and the changes were generated and
applied mechanically with gofmt -r and comby, respecting the lexical and
syntactic rules of Go.  Even so, I did not fix every inconsistency. Where the
changes would be too disruptive, I left it alone.

The principles I followed in this cleanup are:

- Remove aliases that restate the package name.
- Remove aliases where the base package name is unambiguous.
- Move overly-terse abbreviations from the import to the usage site.
- Fix lexical issues (remove underscores, remove capitalization).
- Fix import groupings to more closely match the style guide.
- Group blank (side-effecting) imports and ensure they are commented.
- Add aliases to multiple imports with the same base package name.

* remove counter app

* remove unneeeded ci

* lint fix

* modify tx sizes

* cleanup docs

* Update abci/cmd/abci-cli/abci-cli.go

Co-authored-by: Callum Waters <cmwaters19@gmail.com>

* Update docs/app-dev/getting-started.md

Co-authored-by: Callum Waters <cmwaters19@gmail.com>

* Update docs/app-dev/getting-started.md

Co-authored-by: Callum Waters <cmwaters19@gmail.com>

* bring back comment

* migrate to kvstore and not persistent

* remove unused func

* test persistent

Co-authored-by: Callum Waters <cmwaters19@gmail.com>

`abci.Client`:

- Sync and Async methods now accept a context for cancellation
    * grpc client uses context to cancel both Sync and Async requests
    * local client ignores context parameter
    * socket client uses context to cancel Sync requests and to drop Async requests before sending them if context was cancelled prior to that

- Async methods return an error
    * socket client returns an error immediately if queue is full for Async requests
    * local client always returns nil error
    * grpc client returns an error if context was cancelled before we got response or the receiving queue had a space for response (do not confuse with the sending queue from the socket client)

- specify clients semantics in [doc.go](https://raw.githubusercontent.com/tendermint/tendermint/27112fffa62276bc016d56741f686f0f77931748/abci/client/doc.go)

`mempool.TxInfo`

- add optional `Context` to `TxInfo`, which can be used to cancel `CheckTx` request

Closes #5190

Secp256k1 was removed in the protobuf migration, this pr adds it back in order to provide this functionality for users (band)

Closes: #5495

Remove Response/Request SetOption from ABCI.

Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>

## Description

add more error checks to tests


gonna do a third PR that tackles the non test cases

Reorganizes the Protobuf schemas. It is mostly bikeshedding, so if something is contentious or causes a lot of extra work then I'm fine with reverting. Some Protobuf and Go import paths will change.

* Move `abci/types/types.proto` to `abci/types.proto`.

* Move `crypto/keys/types.proto` and `crypto/merkle/types.proto` to `crypto/keys.proto` and `crypto/proof.proto`.

* Drop the use of `msgs` in filenames, as "message" is a very overloaded term (all Protobuf types are messages, and we also have `message Message`). Use `types.proto` as a catch-all, and otherwise name files by conceptual grouping instead of message kind.

## Description

partially cleanup in preparation for errcheck

i ignored a bunch of defer errors in tests but with the update to go 1.14 we can use `t.Cleanup(func() { if err := <>; err != nil {..}}` to cover those errors, I will do this in pr number two of enabling errcheck.

ref #5059

in `persistent_kvstore`

Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>

## Description

- remove keyname suffix from keys


Closes: #2228

Fixes these test failures:

```
=== RUN   TestKVStore
### Testing KVStore 
I[2020-05-25|13:32:31.303] Starting ABCIServer service                  module=abci-server impl=ABCIServer
    TestKVStore: example_test.go:48: 
                Error Trace:    example_test.go:48
                                                        example_test.go:28
                Error:          Received unexpected error:
                                listen unix test.sock: bind: address already in use
                Test:           TestKVStore
                Messages:       Error starting socket server
--- FAIL: TestKVStore (0.00s) 
```

## Description

remove unused and unmaintained python examples of abci

Closes: #XXX

Fix some linter issues to conform with the Protobuf style guide.

The state sync enum changes are ok to break since it's not released yet. Personally I find the uppercase kind of ugly, but that's what the guide says. Couldn't find a way to generate camel case in Go, short of specifying custom names for each and every enum variant.

Another option would be to simply disable the enum case lint.

Adds the ABCI interface for [state sync](https://github.com/tendermint/tendermint/issues/828) as outlined in [ADR-053](https://github.com/tendermint/tendermint/blob/master/docs/architecture/adr-053-state-sync-prototype.md), and bumps ABCIVersion to `0.17.0`.

The interface adds a new ABCI connection which Tendermint can use to query and load snapshots from the app (for serving snapshots to other nodes), and to offer and apply snapshots to the app (for state syncing a local node from peers).

Split out from the original PR in #4645, state sync reactor will be submitted as a separate PR. The interface is implemented by the Cosmos SDK in https://github.com/cosmos/cosmos-sdk/pull/5803.

The PR added a new field `index` to event attribute, that will cause indexer service to index the event if set to true.

* Added BlockStore.DeleteBlock()

* Added initial block pruner prototype

* wip

* Added BlockStore.PruneBlocks()

* Added consensus setting for block pruning

* Added BlockStore base

* Error on replay if base does not have blocks

* Handle missing blocks when sending VoteSetMaj23Message

* Error message tweak

* Properly update blockstore state

* Error message fix again

* blockchain: ignore peer missing blocks

* Added FIXME

* Added test for block replay with truncated history

* Handle peer base in blockchain reactor

* Improved replay error handling

* Added tests for Store.PruneBlocks()

* Fix non-RPC handling of truncated block history

* Panic on missing block meta in needProofBlock()

* Updated changelog

* Handle truncated block history in RPC layer

* Added info about earliest block in /status RPC

* Reorder height and base in blockchain reactor messages

* Updated changelog

* Fix tests

* Appease linter

* Minor review fixes

* Non-empty BlockStores should always have base > 0

* Update code to assume base > 0 invariant

* Added blockstore tests for pruning to 0

* Make sure we don't prune below the current base

* Added BlockStore.Size()

* config: added retain_blocks recommendations

* Update v1 blockchain reactor to handle blockstore base

* Added state database pruning

* Propagate errors on missing validator sets

* Comment tweaks

* Improved error message

Co-Authored-By: Anton Kaliaev <anton.kalyaev@gmail.com>

* use ABCI field ResponseCommit.retain_height instead of retain-blocks config option

* remove State.RetainHeight, return value instead

* fix minor issues

* rename pruneHeights() to pruneBlocks()

* noop to fix GitHub borkage

Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>

* format: add format cmd & goimport repo

- replaced format command
- added goimports to format command
- ran goimports

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* fix outliers & undo proto file changes

* example/kvstore: return ABCI query height

* CHANGELOG: added PR link

* Updated tests

* dep: update tm-db to 0.4.0

- update 0.4.0 as it is a breaking change and cannot be handled by depndabot

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

*  more work towards error handling

* error and emtpy bytes handling

* work on tests

* add changelog entry, change some error handling

* address some pr comments

* panic in a few more places

* move error higher up

* redo some error handling

* fix some bz == nil to len(bz) == 0

* change statebytes

* lint: golint issue fixes

- on my local machine golint is a lot stricter than the bot so slowly going through and fixing things.

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* more fixes from golint

* remove isPeerPersistentFn

* add changelog entry

* libs/common: Refactor libs/common 5

- move mathematical functions and types out of `libs/common` to math pkg
- move net functions out of `libs/common` to net pkg
- move string functions out of `libs/common` to strings pkg
- move async functions out of `libs/common` to async pkg
- move bit functions out of `libs/common` to bits pkg
- move cmap functions out of `libs/common` to cmap pkg
- move os functions out of `libs/common` to os pkg

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* fix testing issues

* fix tests

closes #41417

woooooooooooooooooo kill the cmn pkg

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* add changelog entry

* fix goimport issues

* run gofmt

* libs/common: refactor libs common 3

- move nil.go into types folder and make private
- move service & baseservice out of common into service pkg

ref #4147

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* add changelog entry

Fixes #4177

* libs/common: refactor libs/common 2

- move random function to there own pkg

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* change imports and usage throughout repo

* fix goimports

* add changelog entry

* libs/common: Refactor libs/common 01

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* regenerate proto files, move intslice to where its used

* update kv.KVPair(s) to kv.Pair(s)

* add changelog entry

* make intInSlice private

* Fix many golint errors

* Fix golint errors in the 'lite' package

* Don't export Pool.store

* Fix typo

* Revert unwanted changes

* Fix errors in counter package

* Fix linter errors in kvstore package

* Fix linter error in example package

* Fix error in tests package

* Fix linter errors in v2 package

* Fix linter errors in consensus package

* Fix linter errors in evidence package

* Fix linter error in fail package

* Fix linter errors in query package

* Fix linter errors in core package

* Fix linter errors in node package

* Fix linter errors in mempool package

* Fix linter error in conn package

* Fix linter errors in pex package

* Rename PEXReactor export to Reactor

* Fix linter errors in trust package

* Fix linter errors in upnp package

* Fix linter errors in p2p package

* Fix linter errors in proxy package

* Fix linter errors in mock_test package

* Fix linter error in client_test package

* Fix linter errors in coretypes package

* Fix linter errors in coregrpc package

* Fix linter errors in rpcserver package

* Fix linter errors in rpctypes package

* Fix linter errors in rpctest package

* Fix linter error in json2wal script

* Fix linter error in wal2json script

* Fix linter errors in kv package

* Fix linter error in state package

* Fix linter error in grpc_client

* Fix linter errors in types package

* Fix linter error in version package

* Fix remaining errors

* Address review comments

* Fix broken tests

* Reconcile package coregrpc

* Fix golangci bot error

* Fix new golint errors

* Fix broken reference

* Enable golint linter

* minor changes to bring golint into line

* fix failing test

* fix pex reactor naming

* address PR comments

* Fix long line errors in abci, crypto, and libs packages

* Fix long lines in p2p and rpc packages

* Fix long lines in abci, state, and tools packages

* Fix long lines in behaviour and blockchain packages

* Fix long lines in cmd and config packages

* Begin fixing long lines in consensus package

* Finish fixing long lines in consensus package

* Add lll exclusion for lines containing URLs

* Fix long lines in crypto package

* Fix long lines in evidence package

* Fix long lines in mempool and node packages

* Fix long lines in libs package

* Fix long lines in lite package

* Fix new long line in node package

* Fix long lines in p2p package

* Ignore gocritic warning

* Fix long lines in privval package

* Fix long lines in rpc package

* Fix long lines in scripts package

* Fix long lines in state package

* Fix long lines in tools package

* Fix long lines in types package

* Enable lll linter

* Fix maligned structs

* Fix interfacer errors

* Revert accidental go.mod and go.sum changes

* Revert P2PConfig struct maligned reorder

* Revert PeerRoundState struct maligned reordering

* Revert RoundState struct maligned reordering

* Reorder WSClient struct

* Revert accidental type change

* Clean up type change

* Clean up type changes

* Revert to types.ABCIApplicationServer in GRPCServer struct

* Revert maligned changes to BaseConfig struct

* Fix tests in io_test.go

* Fix client_test package tests

* Fix reactor tests in consensus package

* Fix new interfacer errors

* Remove unnecessary type conversions

* Consolidate repeated strings into consts

* Clothe return statements

* Update blockchain/v1/reactor_fsm_test.go

Co-Authored-By: Anton Kaliaev <anton.kalyaev@gmail.com>

This PR repairs linter errors seen when running the following commands:
golangci-lint run --no-config --disable-all=true --enable=unconvert
golangci-lint run --no-config --disable-all=true --enable=goconst
golangci-lint run --no-config --disable-all=true --enable=nakedret

Contributes to #3262

Refs #3262

* tm-cmn to tm-db

* go.mod changes

* go.mod changes

* more go.mod

* fix tm-db

* ci fix, pending change

Add gocritic as a linter

    The linting is not complete, but should i complete in this PR or in a following.

    23 files have been touched so it may be better to do in a following PR


Commits:

* Add gocritic to linting

- Added gocritic to linting

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* gocritic

* pr comments

* remove switch in cmdBatch

cleanup to add linter

    grpc change:
        https://godoc.org/google.golang.org/grpc#WithContextDialer
        https://godoc.org/google.golang.org/grpc#WithDialer
        grpc/grpc-go#2627
    prometheous change:
        due to UninstrumentedHandler, being deprecated in the future
    empty branch = empty if or else statement
        didn't delete them entirely but commented
        couldn't find a reason to have them
    could not replicate the issue #3406
        but if want to keep it commented then we should comment out the if statement as well