[pkg-go] golang-github-prometheus-tsdb is marked for autoremoval from testing

[Debian testing autoremoval watch]

golang-github-prometheus-tsdb 0.0~git20180711.99a2c43-1 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)