Description of problem:
After updating overcloud from osp13 ga to passed_phase2 (z2)
the test tempest.api.identity.admin.v3.test_roles.RolesV3TestJSON fails with the following error:
        
ft1.9: tempest.api.identity.admin.v3.test_roles.RolesV3TestJSON.test_implied_roles_create_check_show_delete[id-c90c316c-d706-4728-bcba-eb1912081b69]_StringException: pythonlogging:'': {{{
2018-08-12 13:52:00,796 7589 INFO     [tempest.lib.common.rest_client] Request (RolesV3TestJSON:test_implied_roles_create_check_show_delete): 201 PUT http://192.168.24.9:35357/v3/roles/d20f2c42e0ec4e24af008a81aa1ffc67/implies/2246bc6fe7c34588b02bd167515113bf 0.354s
2018-08-12 13:52:00,797 7589 DEBUG    [tempest.lib.common.rest_client] Request - Headers: {'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}
        Body: None
    Response - Headers: {'status': '201', u'content-length': '513', 'content-location': 'http://192.168.24.9:35357/v3/roles/d20f2c42e0ec4e24af008a81aa1ffc67/implies/2246bc6fe7c34588b02bd167515113bf', u'vary': 'X-Auth-Token', u'server': 'Apache', u'connection': 'close', u'date': 'Sun, 12 Aug 2018 17:52:00 GMT', u'content-type': 'application/json', u'x-openstack-request-id': 'req-2980b312-f813-4c90-9a6d-93e436efb25e'}
        Body: {"role_inference": {"implies": {"id": "2246bc6fe7c34588b02bd167515113bf", "links": {"self": "http://192.168.24.9:35357/v3/roles/2246bc6fe7c34588b02bd167515113bf"}, "name": "tempest-role-1735135783"}, "prior_role": {"id": "d20f2c42e0ec4e24af008a81aa1ffc67", "links": {"self": "http://192.168.24.9:35357/v3/roles/d20f2c42e0ec4e24af008a81aa1ffc67"}, "name": "tempest-role-754464861"}}, "links": {"self": "http://192.168.24.9:35357/v3/roles/d20f2c42e0ec4e24af008a81aa1ffc67/implies/2246bc6fe7c34588b02bd167515113bf"}}
2018-08-12 13:52:01,252 7589 INFO     [tempest.lib.common.rest_client] Request (RolesV3TestJSON:test_implied_roles_create_check_show_delete): 200 HEAD http://192.168.24.9:35357/v3/roles/d20f2c42e0ec4e24af008a81aa1ffc67/implies/2246bc6fe7c34588b02bd167515113bf 0.455s
2018-08-12 13:52:01,253 7589 DEBUG    [tempest.lib.common.rest_client] Request - Headers: {'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}
        Body: None
    Response - Headers: {'status': '200', u'content-length': '513', 'content-location': 'http://192.168.24.9:35357/v3/roles/d20f2c42e0ec4e24af008a81aa1ffc67/implies/2246bc6fe7c34588b02bd167515113bf', u'vary': 'X-Auth-Token,Accept-Encoding', u'server': 'Apache', u'connection': 'close', u'date': 'Sun, 12 Aug 2018 17:52:01 GMT', u'content-type': 'application/json', u'x-openstack-request-id': 'req-df9012e3-656b-4fb7-b554-f7b62f48e351'}
        Body: 
2018-08-12 13:52:01,649 7589 INFO     [tempest.lib.common.rest_client] Request (RolesV3TestJSON:_run_cleanups): 204 DELETE http://192.168.24.9:35357/v3/roles/d20f2c42e0ec4e24af008a81aa1ffc67/implies/2246bc6fe7c34588b02bd167515113bf 0.381s
2018-08-12 13:52:01,650 7589 DEBUG    [tempest.lib.common.rest_client] Request - Headers: {'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}
        Body: None
    Response - Headers: {'status': '204', 'content-location': 'http://192.168.24.9:35357/v3/roles/d20f2c42e0ec4e24af008a81aa1ffc67/implies/2246bc6fe7c34588b02bd167515113bf', u'vary': 'X-Auth-Token', u'server': 'Apache', u'connection': 'close', u'date': 'Sun, 12 Aug 2018 17:52:01 GMT', u'content-type': 'text/plain', u'x-openstack-request-id': 'req-01a37bb5-9e73-4ea6-8bf6-5afc9859ee55'}
        Body:
}}}

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/tempest/api/identity/admin/v3/test_roles.py", line 208, in test_implied_roles_create_check_show_delete
    prior_role_id, implies_role_id)
  File "/usr/lib/python2.7/site-packages/tempest/lib/services/identity/v3/roles_client.py", line 233, in check_role_inference_rule
    self.expected_success(204, resp.status)
  File "/usr/lib/python2.7/site-packages/tempest/lib/common/rest_client.py", line 261, in expected_success
    raise exceptions.InvalidHttpSuccessCode(details)
tempest.lib.exceptions.InvalidHttpSuccessCode: The success code is different than the expected one
Details: Unexpected http success status code 200, The expected status code is 204

Version-Release number of selected component (if applicable):
python2-tempest-18.0.0-2.el7ost.noarch
openstack-tempest-18.0.0-2.el7ost.noarch
python2-tempestconf-1.1.5-0.20180326143753.f9d956f.el7ost.noarch


How reproducible:


Steps to Reproduce:
1. Install osp13 ga 
2. update to passed_phase2 (in this case 2018-08-03.3)
3. Run tempest suite "all"

Actual results:


Expected results:


Additional info: