zebra: IPv6 MP-BGP Routes addition and deletion

This patch contains the following:
1. Addition of IPv6 SAFI_MULTICAST BGP routes into the RTM's RIB.
2. Deletion of IPv6 SAFI_MULTICAST BGP routes from the RTM's RIB.
diff --git a/zebra/rt_netlink.c b/zebra/rt_netlink.c
index 8e1285d..f48df2b 100644
--- a/zebra/rt_netlink.c
+++ b/zebra/rt_netlink.c
@@ -734,7 +734,7 @@
       p.prefixlen = rtm->rtm_dst_len;
 
       rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, flags, &p, gate, index, table,
-		    metric, 0);
+		    metric, 0, SAFI_UNICAST);
     }
 #endif /* HAVE_IPV6 */
 
@@ -895,9 +895,9 @@
         }
 
       if (h->nlmsg_type == RTM_NEWROUTE)
-        rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, table, metric, 0);
+        rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, table, metric, 0, SAFI_UNICAST);
       else
-        rib_delete_ipv6 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, table);
+        rib_delete_ipv6 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, table, SAFI_UNICAST);
     }
 #endif /* HAVE_IPV6 */