Merge pull request #55987 from joscollin/wip-64743-reef

reef: mds: add a command to dump directory information

Reviewed-by: Venky Shankar <vshankar@redhat.com>

diff --cc qa/tasks/cephfs/test_misc.py
Simple merge

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

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