Add pipeline_email_service. Fixes:
Add pipeline_email_service. Fixes:

https://gitlab.com/gitlab-org/gitlab-ce/builds/4710913

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