client to here.  Policies are things like only plab service slices do
rusage reports and local nodes don't check for cvsup updates, etc.
Maybe these should all be sitevars, but I didn't really want to have
20 different watchdog-related timeout values.

Note: the detection of what is a plab service slice is a hack right
now (string ends in "-20").  Kirk will be giving me a better way RSN.