ip_version is mandatory for quantum create_subnet

Change-Id: I6e0e0afc5d825c00c4b4ecafa893c8a582faadc7
Use physical_resource_name for quantum/vpc resources.

This give a bit more namespace seperation for quantum resource names.

Change-Id: I72736b4409937eb8511ef94dc58407aed20a0f67
Merge "ip_version is mandatory for quantum create_subnet"
Merge "Use physical_resource_name for quantum/vpc resources."