Merge PR #30890 into master

* refs/pull/30890/head:
	mgr: invoke plugin shutdown on SIG{TERM,INT} signals.
	mgr/volumes: guard volume delete by waiting for pending ops
	mgr/volumes: cleanup libcephfs handles when stopping
	Revert "qa/suites/rados/mgr/tasks/module_selftest: whitelist mgr client getting backlisted"

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

diff --cc src/pybind/mgr/volumes/fs/volume.py
Simple merge

diff --cc src/pybind/mgr/volumes/module.py
Simple merge