Comment 8 for bug 1257561

Looking at some of the other compute and image API tests in tempest related to creating images from a server instance, they use a helper method in the base class here:

https://github.com/openstack/tempest/blob/master/tempest/api/compute/base.py#L165

That waits for not only the instance to be active but also the image. When creating backups of a server instance, we're just creating snapshot images and deleting older snapshots (via the rotation parameter to the API). So the test_create_backup test for the compute API should probably also be waiting for the snapshot images to be ACTIVE before continuing.