Merge PR #18139 into master

* refs/pull/18139/head:
	test: make the LibCephFS.ShutdownRacer test even more thrashy
	lockdep: free_ids and lock_ref hashes must be truly global
	common: add a clear_g_str_vec() function to clear g_str_vec
	common: make it safe to call env_to_vec multiple times

Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>