Add specs for Sidekiq changes introduced in !1048
https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/1048 introduces some changes to our Sidekiq service file. These changes should be tested, somehow.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/1048 introduces some changes to our Sidekiq service file. These changes should be tested, somehow.