[pkg-go] golang-golang-x-oauth2 is marked for autoremoval from testing

[Debian testing autoremoval watch]

golang-golang-x-oauth2 0.0~git20160416.0.7e9cd5d-1 is marked for autoremoval from testing on 2016-08-21

It (build-)depends on packages with these RC bugs:
830325: golang-google-grpc: FTBFS: unsatisfiable build-dependencies: golang-github-golang-glog-dev, golang-github-golang-protobuf-dev