Fix invalid vn-id used in L2 Routes for VRRP and Ethernet MAC

L2 Route added for VRRP and Ethernet Mac was always set to 0 since
vxlan_id is not set in path. Modified the L2ReceiveRoute to set right
vxlan_id

Change-Id: Iab004b705dafe6d132121fdc844c3134199bf729