Expose VRRP router VRIDs for compressed_ha

Expose the VRIDs assigned to the controller and swift VRRP groups
created in the compressed_ha scenario to allow users to avoid conflicts
with existing VRIDs in their environment.

Closes-Bug: #1280277
Merge pull request #59 from CiscoSystems/bugs/1280277

Expose VRRP router VRIDs for compressed_ha