Add IPv6 default route(fe80::5e00:0100 route advertised through RA) on Vn Add notification and remove it on Vrf delete notification. This is required since vrouter needs to respond neighbor solicit for the default route.
Closes-Bug: #1391047

Change-Id: Ic280ff8ad2845ba2ae0fdcea54da66c830df46d3
Merge "Add IPv6 default route(fe80::5e00:0100 route advertised through RA) on Vn Add notification and remove it on Vrf delete notification. This is required since vrouter needs to respond neighbor solicit for the default route. Closes-Bug: #1391047"