test_volume_client: test_put_object_versioned is unreliable
test_put_object_versioned in test_volume_client.py succeeds if it receives a CommandFailedError exception from the embedded python program. This manner of testing is unreliable since the embedded python program contains multiple statements and the same exception may be raised by any of those. This has happened twice AFAIR: first, the test never failed despite of the fact that ceph_volume_client.py's put_object_versioned() was buggy and second while i am working to make the embedded python programs in test_volume_client.py python3 compatible. Therefore, it's best to rewrite this test so it doesn't depend on a generic exception for passing.
I'll add a commit for this to .