Bump gitlab-shell version to 4.0.0
New version includes https://gitlab.com/gitlab-org/gitlab-shell/merge_requests/102 and needed for https://gitlab.com/gitlab-org/gitlab-ce/issues/2772
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
New version includes https://gitlab.com/gitlab-org/gitlab-shell/merge_requests/102 and needed for https://gitlab.com/gitlab-org/gitlab-ce/issues/2772