This is an amalgamation of a handful of small changes to Go deps.
Notably:
- we remove our opencensus-proto fork, use upstream, use exclude=src to
fix the build
- unvendorify some deps
- bump io_rules_go to fix WKT resolution
Notably, we now do not have the 'protoc-gen-go' error when running
kubecfg/kubectl anymore.
Change-Id: I34fb9e78b2b12e4543142183d601d01987076f32
This removes some old skylib/zlib deps, moves all Go repositories to a
separate file, and in general does a small cleanup pass on external
repository magic.
Change-Id: Ic9700ee4c40cdb2e5a68e4fc7c6b3e386a109f8a
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