list floating ip api contains port forwarding id

Neutron has added a new extension `floating-ip-port-forwarding-detail`,
which defines that when listing floating ip, it returns the port
forwardng's id and 'internal_port_id'.
This patch updates the list floating ip verification content.

[1] https://review.opendev.org/c/openstack/neutron/+/840565

Change-Id: I5a82d745a9bd9d098ddf8902cdd58d1e81bd80ea
2 files changed