[DRE-maint] gitlab is marked for autoremoval from testing

[Debian testing autoremoval watch]

gitlab 8.4.3+dfsg-12 is marked for autoremoval from testing on 2016-04-28

It (build-)depends on packages with these RC bugs:
818259: ruby-fog-atmos: git usage in gemspec
818470: ruby-mousetrap-rails: missing dependencies on ruby modules