[pkg-go] golang-github-docker-go-metrics is marked for autoremoval from testing

[Debian testing autoremoval watch]

golang-github-docker-go-metrics 0.0~git20180209.399ea8c-1 is marked for autoremoval from testing on 2018-09-29

It (build-)depends on packages with these RC bugs:
902468: golang-github-mwitkow-go-conntrack: FTBFS in buster/sid (failing tests)