Merge PR #38640 into master

* refs/pull/38640/head:
	qa: add test for reserved keyword feature
	qa: use no client for required client feature tests
	mds: do not allow setting a reserved feature by name
	mds: return sv for efficiency

Reviewed-by: Jos Collin <jcollin@redhat.com>
Reviewed-by: Rishabh Dave <ridave@redhat.com>

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