[API] Filtering by fields not allowed to see is possible for regular users

[Slawek Kaplonski]

It seems that regular user, even if can't see binding:host_id field for the port can filter based on this field:

neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
+--------------------------------------+
| id |
+--------------------------------------+
| 79949e8d-98dc-4fba-8897-c85a2bf89da7 |
| 7b91b484-4a9d-4160-84f7-bf1aed35d42a |
| 92023b4e-11bd-42be-a60d-609dc237873d |
| d987e708-1439-411d-848c-15a918ec3198 |
+--------------------------------------+

 [stack@undercloud-0 ~]$ neutron port-list --binding:host_id compute-1.redhat.local
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
+--------------------------------------+------+-------------------+----------------------------------------------------------------------------------------+
| id | name | mac_address | fixed_ips |
+--------------------------------------+------+-------------------+----------------------------------------------------------------------------------------+
| 7b91b484-4a9d-4160-84f7-bf1aed35d42a | | fa:16:3e:38:fe:b6 | {"subnet_id": "da9e51d0-a9a5-43ee-8ae1-d79bbfd9ee71", "ip_address": "192.168.100.151"} |
+--------------------------------------+------+-------------------+----------------------------------------------------------------------------------------+
 [stack@undercloud-0 ~]$ neutron port-list --binding:host_id compute-0.redhat.local
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.

[vinay harsha mitta (vinay7)]

Hi adding my understanding here regarding this bug, please let me know if i miss something:
With reference to this[1] i could understand that a regular user's response doesn't contain binding-opt,
but a admin do[2], so a regular user should be restricted with that filtering field.

reproduced in my single host env:http://paste.openstack.org/show/798593/

[1] : https://docs.openstack.org/api-ref/network/v2/index.html?expanded=list-ports-detail#id70

[2] : https://docs.openstack.org/api-ref/network/v2/index.html?expanded=list-ports-detail#id71