Merge pull request #50569 from rishabh-d-dave/CephManager-in-CephFSTestCase

qa/cephfs: add helper methods in CephFSTestCase

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

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

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

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

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