Add support for configuring workhorse's api limiting
Fixes: https://gitlab.com/gitlab-org/omnibus-gitlab/issues/1613
MR in workhorse for the setting went in here: https://gitlab.com/gitlab-org/gitlab-workhorse/merge_requests/65
cc\ @ayufan
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Fixes: https://gitlab.com/gitlab-org/omnibus-gitlab/issues/1613
MR in workhorse for the setting went in here: https://gitlab.com/gitlab-org/gitlab-workhorse/merge_requests/65
cc\ @ayufan