GitLab 8.6.6 release post
To be merged once 8.6.6 is released: https://gitlab.com/gitlab-org/gitlab-ce/issues/15180
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
To be merged once 8.6.6 is released: https://gitlab.com/gitlab-org/gitlab-ce/issues/15180