tempest: Openstack-floating-ip associattion to a port which is created in different project failed

Test case:
=======
[stack@undercloud tempest]$ sudo ostestr --pdb neutron_tempest_plugin.api.admin.test_floating_ips_admin_actions.FloatingIPAdminTestJSON.test_associate_floating_ip_with_port_from_another_project

==============================
(overcloud) [stack@undercloud ~]$ neutron floatingip-associate bc20a4e5-eb66-4583-9a69-de674147a915 33d6b8aa-6339-44f4-9bba-e6281ce1fc7f
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
Bad floatingip request: port can't be associated with this fip as they both belong to different tenants.
Neutron server returns request_ids: ['req-294c6161-53ce-4d9a-ace7-6c97d1722598']
(overcloud) [stack@undercloud ~]$

(overcloud) [stack@undercloud ~]$ openstack port show 33d6b8aa-6339-44f4-9bba-e6281ce1fc7f
+-----------------------+---------------------------------------------------------------------------+
| Field | Value |
+-----------------------+---------------------------------------------------------------------------+
| admin_state_up | UP |
| allowed_address_pairs | |
| binding_host_id | None |
| binding_profile | None |
| binding_vif_details | port_filter='True' |
| binding_vif_type | vrouter |
| binding_vnic_type | normal |
| created_at | None |
| data_plane_status | None |
| description | |
| device_id | |
| device_owner | |
| dns_assignment | None |
| dns_name | None |
| extra_dhcp_opts | None |
| fixed_ips | ip_address='10.100.0.4', subnet_id='031bb45c-ccba-4bea-8ddd-ec9cfa65b4ba' |
| id | 33d6b8aa-6339-44f4-9bba-e6281ce1fc7f |
| ip_address | None |
| mac_address | 02:33:d6:b8:aa:63 |
| name | 33d6b8aa-6339-44f4-9bba-e6281ce1fc7f |
| network_id | bccd13b2-dc57-44e6-a914-ecac79bcc528 |
| option_name | None |
| option_value | None |
| port_security_enabled | True |
| project_id | f663f2ebb1224478b2ca2ed40ac44424 |
| qos_policy_id | None |
| revision_number | None |
| security_group_ids | bd3da12c-efa7-48f3-82bd-fd87f0804394 |
| status | DOWN |
| subnet_id | None |
| tags | |
| trunk_details | None |
| updated_at | None |
+-----------------------+---------------------------------------------------------------------------+

(overcloud) [stack@undercloud ~]$ openstack floating ip show bc20a4e5-eb66-4583-9a69-de674147a915
+---------------------+--------------------------------------+
| Field | Value |
+---------------------+--------------------------------------+
| created_at | None |
| description | |
| fixed_ip_address | None |
| floating_ip_address | 192.168.24.115 |
| floating_network_id | d3ad9805-7a06-4222-9dba-3649a2343ebc |
| id | bc20a4e5-eb66-4583-9a69-de674147a915 |
| name | 192.168.24.115 |
| port_id | None |
| project_id | 0f14ee5bf3ea4456897eb1c62d658d6f |
| qos_policy_id | None |
| revision_number | None |
| router_id | None |
| status | DOWN |
| subnet_id | None |
| updated_at | None |
+---------------------+--------------------------------------+
(overcloud) [stack@undercloud ~]$

(overcloud) [stack@undercloud ~]$ openstack network show d3ad9805-7a06-4222-9dba-3649a2343ebc
+---------------------------+--------------------------------------+
| Field | Value |
+---------------------------+--------------------------------------+
| admin_state_up | UP |
| availability_zone_hints | None |
| availability_zones | None |
| created_at | None |
| description | |
| dns_domain | None |
| id | d3ad9805-7a06-4222-9dba-3649a2343ebc |
| ipv4_address_scope | None |
| ipv6_address_scope | None |
| is_default | None |
| is_vlan_transparent | None |
| mtu | None |
| name | public |
| port_security_enabled | True |
| project_id | 54c718a9c0dd4aebb43e014b9dfa1550 |
| provider:network_type | None |
| provider:physical_network | datacentre |
| provider:segmentation_id | None |
| qos_policy_id | None |
| revision_number | None |
| router:external | External |
| segments | None |
| shared | False |
| status | ACTIVE |
| subnets | 2a5792dd-5c5f-4db6-928d-63169fc1195d |
| tags | |
| updated_at | None |
+---------------------------+--------------------------------------+

Trace
=====

    Traceback (most recent call last):
      File "/usr/lib/python2.7/site-packages/neutron_tempest_plugin/api/admin/test_floating_ips_admin_actions.py", line 58, in test_associate_floating_ip_with_port_from_another_project
        floating_ip['id'], port_id=port['port']['id'])
      File "/usr/lib/python2.7/site-packages/testtools/testcase.py", line 422, in assertRaises
        self.assertThat(our_callable, matcher)
      File "/usr/lib/python2.7/site-packages/testtools/testcase.py", line 433, in assertThat
        mismatch_error = self._matchHelper(matchee, matcher, message, verbose)
      File "/usr/lib/python2.7/site-packages/testtools/testcase.py", line 483, in _matchHelper
        mismatch = matcher.match(matchee)
      File "/usr/lib/python2.7/site-packages/testtools/matchers/_exception.py", line 108, in match
        mismatch = self.exception_matcher.match(exc_info)
      File "/usr/lib/python2.7/site-packages/testtools/matchers/_higherorder.py", line 62, in match
        mismatch = matcher.match(matchee)
      File "/usr/lib/python2.7/site-packages/testtools/testcase.py", line 414, in match
        reraise(*matchee)
      File "/usr/lib/python2.7/site-packages/testtools/matchers/_exception.py", line 101, in match
        result = matchee()
      File "/usr/lib/python2.7/site-packages/testtools/testcase.py", line 969, in __call__
        return self._callable_object(*self._args, **self._kwargs)
      File "/usr/lib/python2.7/site-packages/neutron_tempest_plugin/services/network/json/network_client.py", line 925, in update_floatingip
        put_resp, resp_body = self.put(uri, put_body)
      File "/usr/lib/python2.7/site-packages/tempest/lib/common/rest_client.py", line 343, in put
        return self.request('PUT', url, extra_headers, headers, body, chunked)
      File "/usr/lib/python2.7/site-packages/tempest/lib/common/rest_client.py", line 668, in request
        self._error_checker(resp, resp_body)
      File "/usr/lib/python2.7/site-packages/tempest/lib/common/rest_client.py", line 774, in _error_checker
        raise exceptions.NotFound(resp_body, resp=resp)
    tempest.lib.exceptions.NotFound: Object not found
    Details: {u'message': u'Port 919fb902-af9f-4e47-b53c-3c1be8e67ea3 could not be found.', u'type': u'PortNotFound', u'detail': u''}