Move some of our "policy" about watchdog intervals from the watchdog
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.
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