tearDownClass (tempest.api.network.test_versions.NetworksApiDiscovery)

https://logs.opendaylight.org/releng/jenkins092/netvirt-csit-1node-openstack-pike-upstream-stateful-oxygen/57/log_tempest.html.gz#s1-s1-t1-k2-k1-k1-k13

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Failed 1 tests - output below:
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tearDownClass (tempest.api.network.test_versions.NetworksApiDiscovery)
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Captured traceback:
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Traceback (most recent call last):
File "tempest/test.py", line 224, in tearDownClass
six.reraise(etype, value, trace)
File "tempest/test.py", line 196, in tearDownClass
teardown()
File "tempest/test.py", line 688, in clear_credentials
cls._creds_provider.clear_creds()
File "tempest/lib/common/dynamic_creds.py", line 459, in clear_creds
self._cleanup_default_secgroup(creds.tenant_id)
File "tempest/lib/common/dynamic_creds.py", line 406, in _cleanup_default_secgroup
nsg_client.delete_security_group(secgroup['id'])
File "tempest/lib/services/network/security_groups_client.py", line 59, in delete_security_group
return self.delete_resource(uri)
File "tempest/lib/services/network/base.py", line 41, in delete_resource
resp, body = self.delete(req_uri)
File "tempest/lib/common/rest_client.py", line 310, in delete
return self.request('DELETE', url, extra_headers, headers, body)
File "tempest/lib/common/rest_client.py", line 668, in request
self._error_checker(resp, resp_body)
File "tempest/lib/common/rest_client.py", line 789, in _error_checker
raise exceptions.Conflict(resp_body, resp=resp)
tempest.lib.exceptions.Conflict: An object with that identifier already exists
Details:

{u'message': u'Security Group efd710be-8b5f-4b00-ac1d-07bd3b4a9797 cannot perform precommit_delete due to Callback networking_odl.common.callback.OdlSecurityGroupsHandler.sg_callback_precommit-3970702 failed with "argument of type \'NoneType\' is not iterable".', u'type': u'SecurityGroupInUse', u'detail': u''}