* failing test

* fix infinite loop in addrbook

There are cases where we only have a small number of addresses marked
good ("old"), but the selection mechanism keeps trying to select more of these
addresses, and hence ends up in an infinite loop. Here we fix this to
only try and select such "old" addresses if we have enough of them. Note this
means, if we don't have enough of them, we may return more "new"
addresses than otherwise expected by the newSelectionBias.

This whole GetSelectionWithBias method probably needs to be rewritten,
but this is a quick fix for the issue.

* changelog

* fix infinite loop if not enough new addrs

* fix another potential infinite loop

if a.nNew == 0 -> pickFromOldBucket=true, but we don't have enough items
  (a.nOld > len(oldBucketToAddrsMap) false)

* Revert "fix another potential infinite loop"

This reverts commit 146540c112.

* check num addresses instead of buckets, new test

* fixed the int division

* add slack to bias % in test, lint fixes

* Added checks for selection content in test

* test cleanup

* Apply suggestions from code review

Co-Authored-By: ebuchman <ethan@coinculture.info>

* address review comments

* change after  Anton's review comments

* use the same docker image we use for testing

when building a binary for localnet

* switch back to circleci classic

* more review comments

* more review comments

* refactor addrbook_test

* build linux binary inside docker

in attempt to fix

```
--> Running dep
+ make build-linux
GOOS=linux GOARCH=amd64 make build
make[1]: Entering directory `/home/circleci/.go_workspace/src/github.com/tendermint/tendermint'
CGO_ENABLED=0 go build -ldflags "-X github.com/tendermint/tendermint/version.GitCommit=`git rev-parse --short=8 HEAD`" -tags 'tendermint' -o build/tendermint ./cmd/tendermint/
p2p/pex/addrbook.go:373:13: undefined: math.Round
```

* change dir from /usr to /go

* use concrete Go version for localnet binary

* check for nil addresses just to be sure

This reverts commit 1cf6712a36.

* close peer's connection to avoid fd leak

Fixes #2967

* rename peer#Addr to RemoteAddr

* fix test

* fixes after Ethan's review

* bring back the check

* changelog entry

* write a test for switch#acceptRoutine

* increase timeouts? :(

* remove extra assertNPeersWithTimeout

* simplify test

* assert number of peers (just to be safe)

* Cleanup in OnStop

* run tests with verbose flag on CircleCI

* spawn a reading routine to prevent connection from closing

* get port from the listener

random port is faster, but often results in

```
panic: listen tcp 127.0.0.1:44068: bind: address already in use [recovered]
        panic: listen tcp 127.0.0.1:44068: bind: address already in use

goroutine 79 [running]:
testing.tRunner.func1(0xc0001bd600)
        /usr/local/go/src/testing/testing.go:792 +0x387
panic(0x974d20, 0xc0001b0500)
        /usr/local/go/src/runtime/panic.go:513 +0x1b9
github.com/tendermint/tendermint/p2p.MakeSwitch(0xc0000f42a0, 0x0, 0x9fb9cc, 0x9, 0x9fc346, 0xb, 0xb42128, 0x0, 0x0, 0x0, ...)
        /home/vagrant/go/src/github.com/tendermint/tendermint/p2p/test_util.go:182 +0xa28
github.com/tendermint/tendermint/p2p.MakeConnectedSwitches(0xc0000f42a0, 0x2, 0xb42128, 0xb41eb8, 0x4f1205, 0xc0001bed80, 0x4f16ed)
        /home/vagrant/go/src/github.com/tendermint/tendermint/p2p/test_util.go:75 +0xf9
github.com/tendermint/tendermint/p2p.MakeSwitchPair(0xbb8d20, 0xc0001bd600, 0xb42128, 0x2f7, 0x4f16c0)
        /home/vagrant/go/src/github.com/tendermint/tendermint/p2p/switch_test.go:94 +0x4c
github.com/tendermint/tendermint/p2p.TestSwitches(0xc0001bd600)
        /home/vagrant/go/src/github.com/tendermint/tendermint/p2p/switch_test.go:117 +0x58
testing.tRunner(0xc0001bd600, 0xb42038)
        /usr/local/go/src/testing/testing.go:827 +0xbf
created by testing.(*T).Run
        /usr/local/go/src/testing/testing.go:878 +0x353
exit status 2
FAIL    github.com/tendermint/tendermint/p2p    0.350s
```

* update go version & other cleanup

* fix lints

* go one.eleven.four

* keep circle on 1.11.3 for now

* be like the SDK makefile

* arm: add install script, fix Makefile

* ...

* tests: use make localnet

based on @jackzampolin work in:
https://github.com/cosmos/cosmos-sdk/pull/2067

* keep the p2p tests for now

* fixes after my own review

* nohup

* remove nohup

See https://discuss.circleci.com/t/saving-cache-stopped-working-warning-skipping-this-step-disabled-in-configuration/24423/2

This commit makes it such that circle CI only shows the module whose
tests it is currently running in the log, unless a test fails. For each
failing test, it will display the name of all failing tests, along with
their log output. This is done to make
our log output far more scrollable. We lose no information in debugging.

This adds a new makefile command, which is used in CI linting, `make check_dep`.
This ensures the toml is in sync with the lock, and that were not pinning to a
branch in any repository.

This also adapts `make get_vendor_deps` to check the lock, in addition to
populating the vendor directory. This removes the need for `make ensure_deps`.

This makes `make get_vendor_deps` consistent between tendermint and the sdk.

Currently the top level directory contains basically all of the code
for the crypto package. This PR moves the crypto code into submodules
in a similar manner to what `golang/x/crypto` does. This improves code
organization.

Ref discussion: https://github.com/tendermint/tendermint/pull/1966

Closes #1956

* tools: Remove redundant grep -v vendors/

This was used in conjunction with `go list <path>`, however `go list`
already ignores the vendor directory. This made this `grep -v` redundant.

* Missed an apostrophe

* circleci 2.0