Add "gitlab-ctl set-geo-primary-node" command
Part of gitlab-org/gitlab-ee#1664
Requires https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1533 and https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1579
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Part of gitlab-org/gitlab-ee#1664
Requires https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1533 and https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1579