allowed_address_pair validation should be done to exclude the port IP

Build 1.10 2282

Per openstack documentation :
"Setting an allowed-address-pair that matches the mac_address and ip_address of a port is prevented. This is because that would have no effect since traffic matching the mac_address and ip_address is already allowed to pass through the port."

But Contrail allows such a config :

root@nodec22:/usr/lib/python2.7/dist-packages# neutron port-update 13c5ca47-ff5c-422e-beb5-7f68ae8d129b --allowed-address-pairs type=dict lis
t=true ip_address=100.1.1.3
Updated port: 13c5ca47-ff5c-422e-beb5-7f68ae8d129b
root@nodec22:/usr/lib/python2.7/dist-packages#

root@nodec22:/usr/lib/python2.7/dist-packages# neutron port-show 13c5ca47-ff5c-422e-beb5-7f68ae8d129b
+-----------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Field | Value |
+-----------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| admin_state_up | True |
| allowed_address_pairs | {"ip_address": "100.1.1.3/32", "mac_address": "02:13:c5:ca:47:ff"} |
| device_id | edd9acff-46c4-480d-acf4-b868917d9cd2 |
| device_owner | |
| fixed_ips | {"subnet_id": "26b80e71-a99a-45a3-8a36-c5c3ed348374", "ip_address": "100.1.1.3", "port_id": "13c5ca47-ff5c-422e-beb5-7f68ae8d129b", "net_id": "ddc414fc-e53a-420e-91ab-31095b0b161f"} |
| id | 13c5ca47-ff5c-422e-beb5-7f68ae8d129b |
| mac_address | 02:13:c5:ca:47:ff |
| name | 13c5ca47-ff5c-422e-beb5-7f68ae8d129b |
| network_id | ddc414fc-e53a-420e-91ab-31095b0b161f |
| security_groups | 42c9a8c6-ecd9-4a21-87a4-300f9facc953 |
| status | ACTIVE |
| tenant_id | 3aa6fd0a73b749fda20a2f46ea74d055 |
+-----------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

On a stock openstack with openvswitch:

root@nodec43:/usr/lib/python2.7/dist-packages/neutron/db# neutron port-update 2452fb9e-30fd-41b8-b49a-36e41766389e --allowed-address-pairs type=dict list=true ip_address=70.0.0.2
400-{u'NeutronError': {u'message': u"Port's Fixed IP and Mac Address match an address pair entry.", u'type': u'AddressPairMatchesPortFixedIPAndMac', u'detail': u''}}
root@nodec43:/usr/lib/python2.7/dist-packages/neutron/db#