test_volumes_actions.VolumesActionsTest fails with NeutronError

[Mate Lakat]

Tempest job:
  check-tempest-devstack-vm-neutron-pg-isolated

For the log, look at:
  http://logs.openstack.org/45/53745/2/check/check-tempest-devstack-vm-neutron-pg-isolated/776148e/

Fails with the following errors:

This is the output on the console:

2013-10-24 22:36:07.644 | ======================================================================
2013-10-24 22:36:07.644 | FAIL: tearDownClass (tempest.api.volume.test_volumes_actions.VolumesActionsTest)
2013-10-24 22:36:07.644 | tearDownClass (tempest.api.volume.test_volumes_actions.VolumesActionsTest)
2013-10-24 22:36:07.645 | ----------------------------------------------------------------------
2013-10-24 22:36:07.645 | _StringException: Traceback (most recent call last):
2013-10-24 22:36:07.645 | File "tempest/api/volume/test_volumes_actions.py", line 55, in tearDownClass
2013-10-24 22:36:07.645 | super(VolumesActionsTest, cls).tearDownClass()
2013-10-24 22:36:07.646 | File "tempest/api/volume/base.py", line 72, in tearDownClass
2013-10-24 22:36:07.646 | cls.isolated_creds.clear_isolated_creds()
2013-10-24 22:36:07.646 | File "tempest/common/isolated_creds.py", line 453, in clear_isolated_creds
2013-10-24 22:36:07.647 | self._clear_isolated_net_resources()
2013-10-24 22:36:07.647 | File "tempest/common/isolated_creds.py", line 445, in _clear_isolated_net_resources
2013-10-24 22:36:07.647 | self._clear_isolated_network(network['id'], network['name'])
2013-10-24 22:36:07.648 | File "tempest/common/isolated_creds.py", line 399, in _clear_isolated_network
2013-10-24 22:36:07.648 | net_client.delete_network(network_id)
2013-10-24 22:36:07.648 | File "tempest/services/network/json/network_client.py", line 76, in delete_network
2013-10-24 22:36:07.648 | resp, body = self.delete(uri, self.headers)
2013-10-24 22:36:07.649 | File "tempest/common/rest_client.py", line 308, in delete
2013-10-24 22:36:07.649 | return self.request('DELETE', url, headers)
2013-10-24 22:36:07.649 | File "tempest/common/rest_client.py", line 436, in request
2013-10-24 22:36:07.650 | resp, resp_body)
2013-10-24 22:36:07.650 | File "tempest/common/rest_client.py", line 522, in _error_checker
2013-10-24 22:36:07.650 | raise exceptions.ServerFault(message)
2013-10-24 22:36:07.651 | ServerFault: Got server fault
2013-10-24 22:36:07.651 | Details: {"NeutronError": "Request Failed: internal server error while processing your request."}

This output might also be important:
2013-10-24 22:36:06.965 | Error in atexit._run_exitfuncs:
2013-10-24 22:36:06.965 | Traceback (most recent call last):
2013-10-24 22:36:06.966 | File "/usr/lib/python2.7/atexit.py", line 24, in _run_exitfuncs
2013-10-24 22:36:06.970 | func(*targs, **kargs)
2013-10-24 22:36:06.971 | File "tempest/test.py", line 167, in validate_tearDownClass
2013-10-24 22:36:06.971 | + str(at_exit_set))
2013-10-24 22:36:06.971 | RuntimeError: tearDownClass does not calls the super's tearDownClass in these classes: set([<class 'tempest.api.volume.test_volumes_actions.VolumesActionsTest'>])
2013-10-24 22:36:06.972 | Error in sys.exitfunc:
2013-10-24 22:36:07.192 |
2013-10-24 22:36:07.219 | process-returncode
2013-10-24 22:36:07.220 | process-returncode ... FAIL