Move LDAP settings to own file
And while at it, add a warning about the yaml format to help users from hitting https://gitlab.com/gitlab-org/gitlab-ce/issues/874
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
And while at it, add a warning about the yaml format to help users from hitting https://gitlab.com/gitlab-org/gitlab-ce/issues/874