Merge PR #43284 into main

* refs/pull/43284/head:
	doc: describe bal_rank_mask configuration
	qa/cephfs: add bal_rank_mask test cases
	mds: add bal_rank_mask option for ceph fs set

Reviewed-by: Venky Shankar <vshankar@redhat.com>
Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>
Reviewed-by: Pere Diaz Bou <pdiazbou@redhat.com>

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

diff --cc src/mon/MonCommands.h
Simple merge