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

[Debian testing autoremoval watch]

gitlab 8.12.3+dfsg1-1 is marked for autoremoval from testing on 2016-12-05

It (build-)depends on packages with these RC bugs:
841543: ruby-carrierwave: FTBFS: mysql_install_db: [ERROR] unknown option '--force'
841564: ruby-hipchat: FTBFS: ERROR: Test "ruby2.3" failed: NoMethodError:
842607: ruby-fog-rackspace: FTBFS (undefined method `flavors')