Merge PR #20472 into master

* refs/pull/20472/head:
	mds: add DUMP_DIRFRAGS to CInode and DUMP_ITEMS to CDir
	mds: Enhance dump_tree performance by traversing the tree directly

Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>

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

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

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

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

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

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

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