WIP: Config file
As discussed in https://gitlab.com/gitlab-org/gitlab-workhorse/issues/85#note_21435732
First point on #95
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
As discussed in https://gitlab.com/gitlab-org/gitlab-workhorse/issues/85#note_21435732
First point on #95