Merge pull request #15675 from gregsfortytwo/wip-bad-command

mon,mgr: fix "ceph osd df", add some tools to find untested commands

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

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

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

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