Fix a catastophic bug where launching services-admin would cause the
/tmp/.X11-unix/X[0-9] socket to be deleted thus preventing any new X
applications from starting until X itself was restarted. The problem was
caused by running the cleartmp rc.d script to get service status. The fix
was just to add cleartmp to the list of "forbidden" services.
Reported by: David Vastine <firstname.lastname@example.org>
Approved by: portmgr (implicit)