Add MockCiService integration
MR: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9250/
Conflicts: lib/api/services.rb
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
MR: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9250/
Conflicts: lib/api/services.rb