[9-4-stable] Don't rename system namespace
This is a version of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/13228 based on 9-4-stable
Edited by Bob Van Landuyt :neckbeard:
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This is a version of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/13228 based on 9-4-stable