Merge pull request #3393 from ceph/wip-osd-df

osd: ceph osd df [tree] command

Reviewed-by: Sage Weil <sage@redhat.com>

diff --cc src/crush/CrushWrapper.cc
Simple merge

diff --cc src/crush/CrushWrapper.h
Simple merge

diff --cc src/mon/MonCommands.h
Simple merge

diff --cc src/mon/OSDMonitor.cc
Simple merge

diff --cc src/mon/OSDMonitor.h
Simple merge

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