Flooding Garp packet from fabric interface

In the allowed address pair scenario, to trap the Garp packets from VM,
the route is marked with T flag. But if the Gratuitous packet is from
fabric interface the packet needs to be given to VM's rather getting
trapped to Agent. Right now for all Garp packets, the route flag is
considered and if T is set, it is trapped to agent. This is leading to
Garp not getting flooded to VM's.

As a fix, Garp packets from fabric are always flooded.

Change-Id: I3731ae74df92c03edc0c95502d5984455992179c
closes-bug: #1478662

dp-core/vr_proto_ip.c

@@ -981,6 +981,13 @@ vm_arp_request(struct vr_interface *vif, struct vr_packet *pkt,
 
     sarp = (struct vr_arp *)pkt_data(pkt);
 
+    /*
+     * Garp coming from other compute nodes can be just flooded without
+     * considering the route information
+     */
+    if (vr_grat_arp(sarp) && vif_is_fabric(pkt->vp_if))
+        return MR_FLOOD;
+
     memset(&rt, 0, sizeof(rt));
     rt.rtr_req.rtr_vrf_id = fmd->fmd_dvrf;
     rt.rtr_req.rtr_family = AF_INET;
@@ -1006,6 +1013,7 @@ vm_arp_request(struct vr_interface *vif, struct vr_packet *pkt,
         rt.rtr_nh = NULL;
     }
 
+
     *(uint32_t *)rt.rtr_req.rtr_prefix = (sarp->arp_dpa);
     vr_inet_route_lookup(fmd->fmd_dvrf, &rt);