Change of flow key nh for link local

For link local packets, the packet's nh is RCV NH. The flow key nh for
these packets is chosen by Agent as nh of the interface of RCV NH. To
match this flow key nh, Vrouter also started using this NH as flow key
NH

Change-Id: If29d3a6cc2ae8148d690cd204a6813fb76e9715b
closes-bug: #1712934

dp-core/vr_proto_ip.c

@@ -748,7 +748,8 @@ vr_inet_flow_nexthop(struct vr_packet *pkt, unsigned short vlan)
 
     if (vif_is_fabric(pkt->vp_if) && pkt->vp_nh) {
         /* this is more a requirement from agent */
-        if ((pkt->vp_nh->nh_type == NH_ENCAP)) {
+        if ((pkt->vp_nh->nh_type == NH_ENCAP) ||
+                (pkt->vp_nh->nh_type == NH_RCV)) {
             nh_id = pkt->vp_nh->nh_dev->vif_nh_id;
         } else {
             nh_id = pkt->vp_nh->nh_id;