bgpd: IPv6 MP-BGP Routes addition and deletion

This patch contains the following:
1. Addition of IPv6 SAFI_MULTICAST BGP routes into the BGP Multicast RIB.
2. Deletion of IPv6 SAFI_MULTICAST BGP routes from the BGP Multicast RIB.
diff --git a/bgpd/bgp_zebra.c b/bgpd/bgp_zebra.c
index baf76fb..20feba0 100644
--- a/bgpd/bgp_zebra.c
+++ b/bgpd/bgp_zebra.c
@@ -753,6 +753,7 @@
       api.flags = flags;
       api.type = ZEBRA_ROUTE_BGP;
       api.message = 0;
+      api.safi = safi;
       SET_FLAG (api.message, ZAPI_MESSAGE_NEXTHOP);
       api.nexthop_num = 1;
       api.nexthop = &nexthop;
@@ -869,6 +870,7 @@
       api.flags = flags;
       api.type = ZEBRA_ROUTE_BGP;
       api.message = 0;
+      api.safi = safi;
       SET_FLAG (api.message, ZAPI_MESSAGE_NEXTHOP);
       api.nexthop_num = 1;
       api.nexthop = &nexthop;