Merge PR #28793 into master

Merge PR #28793 into master

* refs/pull/28793/head:
	qa/cephfs: make run_shell() accept args as str too
	qa/vstart_runner.py: ignores when source and destination are same
	test_cephfs_shell: add a test for cd with arguments
	test_cephfs_shell: add a test for cd with no arguments
	test_cephfs_shell: group test methods
	test_cephfs_shell: add a new method to return script output
	test_cephfs_shell: allow running CephFS shell script
	cephfs-shell: cd with no args shouldn't print an error message

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