Move label management to services on merge requests API
Move label management to services on merge requests API

htve/GitlabForChinese,htve/GitlabForChinese,htve/GitlabForChinese,htve/GitlabForChinese,openwide-java/gitlabhq,jirutka/gitlabhq,axilleas/gitlabhq,LUMC/gitlabhq,daiyu/gitlab-zh,axilleas/gitlabhq,axilleas/gitlabhq,jirutka/gitlabhq,darkrasid/gitlabhq,mmkassem/gitlabhq,t-zuehlsdorff/gitlabhq,darkrasid/gitlabhq,dplarson/gitlabhq,dreampet/gitlab,iiet/iiet-git,openwide-java/gitlabhq,LUMC/gitlabhq,daiyu/gitlab-zh,iiet/iiet-git,stoplightio/gitlabhq,jirutka/gitlabhq,darkrasid/gitlabhq,iiet/iiet-git,LUMC/gitlabhq,mmkassem/gitlabhq,t-zuehlsdorff/gitlabhq,dreampet/gitlab,mmkassem/gitlabhq,dplarson/gitlabhq,openwide-java/gitlabhq,mmkassem/gitlabhq,daiyu/gitlab-zh,darkrasid/gitlabhq,dreampet/gitlab,daiyu/gitlab-zh,dplarson/gitlabhq,stoplightio/gitlabhq,t-zuehlsdorff/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,axilleas/gitlabhq,dplarson/gitlabhq,LUMC/gitlabhq,t-zuehlsdorff/gitlabhq,iiet/iiet-git,stoplightio/gitlabhq,openwide-java/gitlabhq,jirutka/gitlabhq