Merge pull request #2314 from ceph/wip-mds-pc

mds: clean up perfcounter names

Reviewed-by: John Spray <john.spray@redhat.com>

diff --cc src/mds/CDir.cc
Simple merge

diff --cc src/mds/MDCache.cc
Simple merge

diff --cc src/mds/MDS.cc
Simple merge

diff --cc src/mds/MDS.h
Simple merge

diff --cc src/mds/Migrator.cc
Simple merge

diff --cc src/mds/Server.cc
Simple merge

diff --cc src/mds/Server.h
Simple merge