Comment 2 for bug 1654177

R4.0 + OSPD10, build CB-25 rhel7+newton

Traceback (most recent call last):
  File "tempest/api/network/test_networks.py", line 629, in test_create_delete_slaac_subnet_with_ports
    self._test_delete_subnet_with_ports("slaac")
  File "tempest/api/network/test_networks.py", line 609, in _test_delete_subnet_with_ports
    self.subnets_client.delete_subnet(subnet_slaac['id'])
  File "tempest/lib/services/network/subnets_client.py", line 52, in delete_subnet
    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 307, in delete
    return self.request('DELETE', url, extra_headers, headers, body)
  File "tempest/lib/common/rest_client.py", line 664, in request
    self._error_checker(resp, resp_body)
  File "tempest/lib/common/rest_client.py", line 766, in _error_checker
    raise exceptions.BadRequest(resp_body, resp=resp)
tempest.lib.exceptions.BadRequest: Bad request
Details: {u'message': u'Bad network request: Cannot Delete IP Block, IP(2003::3) is in use.', u'type': u'BadRequest', u'detail': u''}