Ceph

The pool and osd sections of the pg dump are very useful. The only issue is that the pg dump itself can be very large for large clusters.

There should be an option to limit pg dumps to the "pgs", "poolstats", or "osdstats" sections. The default should be all so current functionality doesn't change.

src/mon/PGMap.cc already has these sections more or less separated. We just need a way to specify which ones to output.