Bumps [github.com/golang/protobuf](https://github.com/golang/protobuf) from 1.4.2 to 1.4.3.
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<h2>v1.4.3</h2>
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<p>(<a href="https://github-redirect.dependabot.com/golang/protobuf/issues/1221">#1221</a>) jsonpb: Fix marshaling of Duration
(<a href="https://github-redirect.dependabot.com/golang/protobuf/issues/1210">#1210</a>) proto: convert integer to rune before converting to string</p>
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<li><a href="4846b58453"><code>4846b58</code></a> jsonpb: Fix marshaling of Duration (<a href="https://github-redirect.dependabot.com/golang/protobuf/issues/1221">#1221</a>)</li>
<li><a href="91c84e0db1"><code>91c84e0</code></a> travis.yml: update tested versions of Go (<a href="https://github-redirect.dependabot.com/golang/protobuf/issues/1211">#1211</a>)</li>
<li><a href="3860b2764f"><code>3860b27</code></a> proto: convert integer to rune before converting to string (<a href="https://github-redirect.dependabot.com/golang/protobuf/issues/1210">#1210</a>)</li>
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Closes#5291. Adds a randomized testnet generator. Nightly CI job will be submitted separately. A few of the testnets can be a bit flaky, even after disabling known-faulty behavior and making minor tweaks, and the larger networks may be too resource-intensive to run in CI - this will be optimized separately.
This was a missing test case from the old P2P tests removed in #5453, which makes sure that all nodes are able to peer with each other regardless of how they discover peers.
Fixes#2795, since the default CI testnet uses a combination of (partially meshed) persistent peers and PEX-based seed nodes.
## Description
In blocks_results we use the proto definition of abciResponses: 2672b91ab0/rpc/core/blocks.go (L152-L155,) this leads to the use of the proto definition of the pubkey which is an interface in go (oneof). The interface must be registered with the JSON encoder to have it work correctly.
A clearer divide between proto types and native types is needed.
Closes: #XXX
Partial fix for #5291.
This adds a basic set of test cases for core network invariants. Although small, it is sufficient to replace and extend the current set of P2P tests. Further test cases can be added later.