Merge pull request #2976 from ceph/wip-pgmeta

osd: move PG metadata to a per-PG object

Passed rados and upgrade tests.

Reviewed-by: Samuel Just <sjust@redhat.com>

diff --cc src/os/FileStore.cc
Simple merge

diff --cc src/os/FileStore.h
Simple merge

diff --cc src/os/MemStore.cc
Simple merge

diff --cc src/os/MemStore.h
Simple merge

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

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

diff --cc src/tools/ceph_objectstore_tool.cc
Simple merge