wip-pg-stale

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Please review.  

If the monitor sees an osdmap go by where nodes go down (or up) it will 
scan its pg_map and mark any pg whose primary is down as 'stale'.  If/when 
the pg recovers, that will get refreshed.  If not, the admin will know 
something is up.

We'll soon be adding the last_active, last_clean, and now last_unstale (?) 
fields so that bigger alarms can go off when the pg stays stale for more 
than a few seconds...

sage
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