Merge PR #28855 into master

* refs/pull/28855/head:
	doc: document scrub summary in ceph status output
	test: extend scrub control test to validate mds task status
	mds: send scrub state changes to cluster log.
	mds: periodically sent mds scrub status to ceph manager
	mgr, mon: allow normal ceph services to register with manager

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

diff --cc qa/tasks/ceph_manager.py
Simple merge

diff --cc src/common/options.cc
Simple merge

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