Merge pull request #61410 from rishabh-d-dave/wip-67976-reef

reef: cephfs,mon: fs rename must require FS to be offline and refuse_client_session to be set

Reviewed-by: Venky Shankar <vshankar@redhat.com>

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

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

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