IP availability list for shared networks

[tom king]

Wishlist item.

For a _member_ role in a project that doesn't own a shared provider network, the user cannot see what IP address availability there is for that network.

(openstack) network list
+--------------------------------------+--------------------------+--------------------------------------+
| ID | Name | Subnets |
+--------------------------------------+--------------------------+--------------------------------------+
........
| 2bfdaa3a-b3c7-414a-934d-1d47751bef4d | AdminNetwork2 | f05a5532-940f-45c7-b3d5-32ec80a485d9 |
+--------------------------------------+--------------------------+--------------------------------------+
(openstack) ip availability show 2bfdaa3a-b3c7-414a-934d-1d47751bef4d
ResourceNotFound: No NetworkIPAvailability found for 2bfdaa3a-b3c7-414a-934d-1d47751bef4d

This naturally works for the network owner:
(openstack) ip availability show 2bfdaa3a-b3c7-414a-934d-1d47751bef4d
+------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------+
| Field | Value |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------+
| id | 2bfdaa3a-b3c7-414a-934d-1d47751bef4d |
| name | None |
| network_id | 2bfdaa3a-b3c7-414a-934d-1d47751bef4d |
| network_name | AdminNetwork2 |
| project_id | 979dbb66b7ea4c648c8a3e906a8b0c79 |
| subnet_ip_availability | cidr='10.145.64.0/18', ip_version='4', subnet_id='f05a5532-940f-45c7-b3d5-32ec80a485d9', subnet_name='2942-sub', total_ips='16381', used_ips='824' |
| total_ips | 16381 |
| used_ips | 824 |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------+

The wish is to allow non-owners see the IP availability IFF the network is shared with the _member_'s project.