Merge PR #52547 into main

* refs/pull/52547/head:
	qa: add test cases for vanilla ops commands
	mds: dump locks when printing mutation ops
	common/TrackedOp: support overriding the _dump method
	mds: remove op field obsoleted by more usable "reqid"
	mds: dump metareq_t instead of full op
	mds: add lock type to formatter dump of SimpleLock
	mds: mark print methods const
	mds: drop MDRequestImpl::msg_lock
	mds: lock TrackedOp when dumping
	mds: avoid recursive locks dumping state
	common/TrackedOp: fix race updating description with proper lock
	common/Formatter: add support for dumping null
	common/Formatter: refactor generating xml name

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