Add "V2 API- add-fixed-IP and remove-fixed-IP server action" tests

This patch adds "V2 API - add-fixed-IP and remove-fixed-IP" tests.

Change-Id: I7f8dcead3c42ae01354891d9fe6fd1ced0136b72
Add "Nova V3 API test for add-fixed-IP/remove-fixed-IP"

This patch adds Nova V3 API test for add-fixed-IP/remove-fixed-IP.

Change-Id: I8448de16d2243bd08db50562eb2714e07b62ea63
Merge "Add "Nova V3 API test for add-fixed-IP/remove-fixed-IP""
Merge "Add "V2 API- add-fixed-IP and remove-fixed-IP server action" tests"