session persistence to NONE

gistfile1.txt

Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "/opt/stack/neutron-lbaas/.tox/scenario/local/lib/python2.7/site-packages/tempest/test.py", line 113, in wrapper
        return f(self, *func_args, **func_kwargs)
      File "neutron_lbaas/tests/tempest/v2/scenario/test_session_persistence.py", line 54, in test_session_persistence
        self._update_pool_session_persistence()
      File "neutron_lbaas/tests/tempest/v2/scenario/base.py", line 577, in _update_pool_session_persistence
        self.pools_client.update_pool(self.pool['id'], **update_data)
      File "neutron_lbaas/tests/tempest/v2/clients/pools_client.py", line 59, in update_pool
        resp, body = self.put(url, post_body)
      File "/opt/stack/neutron-lbaas/.tox/scenario/local/lib/python2.7/site-packages/tempest/lib/common/rest_client.py", line 322, in put
        return self.request('PUT', url, extra_headers, headers, body)
      File "/opt/stack/neutron-lbaas/.tox/scenario/local/lib/python2.7/site-packages/tempest/lib/common/rest_client.py", line 642, in request
        resp, resp_body)
      File "/opt/stack/neutron-lbaas/.tox/scenario/local/lib/python2.7/site-packages/tempest/lib/common/rest_client.py", line 700, in _error_checker
        raise exceptions.BadRequest(resp_body, resp=resp)
    tempest.lib.exceptions.BadRequest: Bad request
    Details: {u'detail': u'', u'message': u"Invalid input for session_persistence. Reason: 'None' is not in ('SOURCE_IP', 'HTTP_COOKIE', 'APP_COOKIE').", u'type': u'HTTPBadRequest'}