Traceback (most recent call last):
  File "keystone/tests/test_v3_protection.py", line 238, in test_revoke_grant_protected_match_target
    expected_status=exception.ForbiddenAction.code)
  File "keystone/tests/test_v3.py", line 364, in delete
    r = self.v3_request(method='DELETE', path=path, **kwargs)
  File "keystone/tests/test_v3.py", line 324, in v3_request
    token = self.get_requested_token(auth)
  File "keystone/tests/test_v3.py", line 316, in get_requested_token
    body=auth)
  File "keystone/tests/test_v3.py", line 277, in admin_request
    r = super(RestfulTestCase, self).admin_request(*args, **kwargs)
  File "keystone/tests/test_content_types.py", line 215, in admin_request
    return self._request(app=self.admin_app, **kwargs)
  File "keystone/tests/test_content_types.py", line 204, in _request
    response = self.restful_request(**kwargs)
  File "keystone/tests/test_content_types.py", line 191, in restful_request
    **kwargs)
  File "keystone/tests/test_content_types.py", line 106, in request
    status=expected_status, **kwargs)
  File "/Users/lars6922/proj/keystone/.tox/py27/lib/python2.7/site-packages/webtest/app.py", line 450, in request
    expect_errors=expect_errors,
  File "/Users/lars6922/proj/keystone/.tox/py27/lib/python2.7/site-packages/webtest/app.py", line 515, in do_request
    self._check_status(status, res)
  File "/Users/lars6922/proj/keystone/.tox/py27/lib/python2.7/site-packages/webtest/app.py", line 544, in _check_status
    res)
AppError: Bad response: 500 Internal Server Error (not 200 OK or 3xx redirect for http://localhost/v3/auth/tokens/auth/tokens/auth/tokens)
'{"error": {"message": "Unable to sign token.", "code": 500, "title": "Internal Server Error"}}'