Add the exposure of relationships to other models to Automate service models

   for Cloud resources like Availability Zones, Cloud Network, Floating IPs

https://bugzilla.redhat.com/show_bug.cgi?id=1131591
Add test cases for the exposed relationships to other models

  of Automate service models for Cloud resources like Availability Zones, Cloud Network, Floating IPs.

https://bugzilla.redhat.com/show_bug.cgi?id=1131591