Set VXLAN-ID flag for VRF-NH

Fixing bug in VRF add processing due to which receive L2 Routes were not
added for VRRP and physical-interface MAC

Change-Id: I1c045c652723f68c8fff3f9b02b9f7961bcf0875
Merge branch 'master' of https://github.com/haripk/contrail-controller into harip_master