Comment 4 for bug 1257561

Actually it might be a problem with this test hitting a window of the task_state changing quickly enough between the windows where we check the status. From looking at the logs, the vm_state is 'active' most of the time but the task_state is constantly changing, and going from 'image_backup' to 'image_pending_upload' to 'null' to not being in the response at all and then back to 'image_backup'.

If anything, we should log the current task_state here along with the current vm_state:

https://github.com/openstack/tempest/blob/master/tempest/common/waiters.py#L81

Because I think it's the task_state that we're timing out on.