bgpd: don't be confused by "unspecific" subcode in the NOTIFY message.

* bgp_debug.c (bgp_notify_open_msg, bgp_notify_update_msg,
  bgp_notify_cease_msg, bgp_notify_capability_msg): add messages for
  "unspecific" subcode.
diff --git a/bgpd/bgpd.h b/bgpd/bgpd.h
index 759d257..91773e3 100644
--- a/bgpd/bgpd.h
+++ b/bgpd/bgpd.h
@@ -631,6 +631,8 @@
 #define BGP_NOTIFY_CAPABILITY_ERR                7
 #define BGP_NOTIFY_MAX	                         8
 
+#define BGP_NOTIFY_SUBCODE_UNSPECIFIC            0
+
 /* BGP_NOTIFY_HEADER_ERR sub codes.  */
 #define BGP_NOTIFY_HEADER_NOT_SYNC               1
 #define BGP_NOTIFY_HEADER_BAD_MESLEN             2
@@ -661,7 +663,7 @@
 #define BGP_NOTIFY_UPDATE_MAL_AS_PATH           11
 #define BGP_NOTIFY_UPDATE_MAX                   12
 
-/* BGP_NOTIFY_CEASE sub codes (draft-ietf-idr-cease-subcode-05).  */
+/* BGP_NOTIFY_CEASE sub codes (RFC 4486).  */
 #define BGP_NOTIFY_CEASE_MAX_PREFIX              1
 #define BGP_NOTIFY_CEASE_ADMIN_SHUTDOWN          2
 #define BGP_NOTIFY_CEASE_PEER_UNCONFIG           3