WIP: Update post
Not to be merged before https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1230 (2017/02/22).
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Not to be merged before https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1230 (2017/02/22).