Merge pull request #1356 from ceph/wip-7458

osd: stray pg ref on shutdown

Reviewed-by: Samuel Just <sam.just@inktank.com>

diff --cc src/osd/OSD.cc
Simple merge

diff --cc src/osd/PG.cc
Simple merge

diff --cc src/osd/PG.h
Simple merge

diff --cc src/osd/ReplicatedPG.cc
Simple merge