Comment 6 for bug 1728640

So we've been working on debugging this some face to face here at the summit and from what I can tell this being caused by something emitted in the logging output from cinder during the unit test execution is causing the subunit parser to error out on the master stestr process as it's processing the results from the test workers. I haven't been able to track down exactly what or where the specific cause is yet though. But, I haven't been able to get the failure mode when I commented out the logging fixtures at: https://github.com/openstack/cinder/blob/master/cinder/test.py#L151-L152