Merge PR #48130 into main

Merge PR #48130 into main

* refs/pull/48130/head:
	qa: add killpoint testing for dirfrags
	qa: stringify arguments to setfattr
	qa: move some configs to cluster-conf
	qa: restore default for config to split exports
	qa/tasks/ceph_test_case: rollback configs using `config reset`
	qa/cephfs: set confs using cluster-conf
	qa/tasks/ceph: provide configuration for setting configs via mon
	mds: optimize MDBalancer code path config access
	mds: add killpoints for directory fragmentation

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