Merge PR #22289 into master

* refs/pull/22289/head:
	mds: put Capability in map container

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

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

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

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