Comment 1 for bug 1748004

Turns out this test was failing as a result of the patch it was failing on, but without logging the exception it was lost:

Captured pythonlogging:
~~~~~~~~~~~~~~~~~~~~~~~
    2018-02-07 20:02:14,002 WARNING [oslo_config.cfg] Config option key_manager.api_class is deprecated. Use option key_manager.backend instead.
    2018-02-07 20:02:14,080 INFO [nova.virt.driver] Loading compute driver 'fake.SmallFakeDriver'
    2018-02-07 20:02:14,090 INFO [nova.compute.manager] Rebuilding instance
    2018-02-07 20:02:14,091 WARNING [nova.compute.monitors] Excluding nova.compute.monitors.cpu monitor virt_driver. Not in the list of enabled monitors (CONF.compute_monitors).
    2018-02-07 20:02:14,093 INFO [nova.compute.manager] disk not on shared storage, rebuilding from: 'None'
    2018-02-07 20:02:14,095 ERROR [nova.compute.manager] Unexpected failure during rebuild.
    Traceback (most recent call last):
      File "nova/compute/manager.py", line 2891, in rebuild_instance
        migration, request_spec)
      File "nova/compute/manager.py", line 2953, in _do_rebuild_instance_with_claim
        self._do_rebuild_instance(*args, **kwargs)
      File "nova/compute/manager.py", line 3015, in _do_rebuild_instance
        context)
      File "nova/image/api.py", line 65, in generate_image_url
        return "%s/images/%s" % (next(glance.get_api_servers(context)),
      File "nova/image/glance.py", line 130, in get_api_servers
        endpoint = re.sub(r'/v\d+(\.\d+)?/?$', '/', endpoint)
      File "/home/osboxes/git/nova/.tox/py27/lib/python2.7/re.py", line 155, in sub
        return _compile(pattern, flags).sub(repl, string, count)
    TypeError: expected string or buffer