-Send Prouter UVE from Agent
-Store PhysicalDevice pointer in PhysicalInterface
-Send prouters associated with Vrouter along with the type of prouter in Vrouter UVE
-Dont send router-id as 0.0.0.0 in vrouter UVE if router-id is not configured
-Add Unit tests

Closes Bug: #1401785

Change-Id: I54b6f86c997d136e80c2f383f33187c1825deefd
Merge "-Send Prouter UVE from Agent -Store PhysicalDevice pointer in PhysicalInterface -Send prouters associated with Vrouter along with the type of prouter in Vrouter UVE -Dont send router-id as 0.0.0.0 in vrouter UVE if router-id is not configured -Add Unit tests"