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

[Debian testing autoremoval watch]

gitlab 8.5.8+dfsg-5 is marked for autoremoval from testing on 2016-05-06

It (build-)depends on packages with these RC bugs:
818470: ruby-mousetrap-rails: missing dependencies on ruby modules
819374: gitlab-shell: has a configuration file in /usr/share and modifies it; also creates a log file there and other links
820349: ruby-re2: FTBFS: #error This file requires compiler and library support for the ISO C++ 2011 standard.
821381: ruby-gollum-lib: ruby-gollum-lib not working with ruby-github-markup 1.4.0
821821: ruby-gollum-lib: gitlab: fails to install in sid: Bundler could not find compatible versions for gem "github-markup"