Ensure 'GITLAB_ADMIN_USERNAME' and 'GITLAB_ADMIN_PASSWORD' are passed to the QA containers
This is a follow-up to https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/21657.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This is a follow-up to https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/21657.