Make sure API responds with 401 when invalid authentication info is provided
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/38438
When the tests go green, I'll split the commit up to make it easier to review.
Edited by Douwe Maan
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/38438
When the tests go green, I'll split the commit up to make it easier to review.