Merge PR #30657 into master

* refs/pull/30657/head:
	test_cephfs_shell: pass arg to "help" in test_help
	cephfs-shell: set exit_code when an error occurs
	cephfs-shell: print traceback only when debug switch is on
	cephfs-shell: catch libcephfs.Error only in onecmd()

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