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/lib/zclient.c b/lib/zclient.c
index 0c3461e..3521d99 100644
--- a/lib/zclient.c
+++ b/lib/zclient.c
@@ -538,6 +538,7 @@
   stream_putc (s, api->type);
   stream_putc (s, api->flags);
   stream_putc (s, api->message);
+  stream_putw (s, api->safi);
   
   /* Put prefix information. */
   psize = PSIZE (p->prefixlen);