osd: mention pgs that do not change during advance_map()
osd: mention pgs that do not change during advance_map()

I was seeing a missed clear_primary_state() for some pgs... not sure why
advance_map() missed them.  Having trouble reproducing.

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph