Apply MLPPP patch from Muhammad Tayseer Alquoatli, very belatedly, with

thanks.  Changes:
- Handle session shutdown gracefully regarding leaving the bundle (bug that is
  caused when a all session leaves a bundle then another join)
- IP assignment is done only for the first session in the bundle (save IP
  waste for multiple MLPPP sessions)
- Route is being added only for the first session in the bundle (less routes
  on l2tpns system)
- Fix route deletion problem for MLPPP sessions (bug that caused when a
  session leaves a bundle)
- Uniformity of sequence number space satisfied (according to RFC1990)
- Fix reassembling fragmented packets and handling lost fragments (according
  to RFC 1990)
- FragmentatConnection to l2tpns.cvs.sourceforge.net closed by remote host.n
  across N session rather than two)
- Sequence numbers extraction mask has been corrected (bug in extracting
  sequence numbers)
- some clustering support fixes
- Upload/Download statistics has been corrected
- add "kill_timedout_sessions" config option

constants.c

@@ -1,6 +1,6 @@
 // L2TPNS: constants
 
-char const *cvs_id_constants = "$Id: constants.c,v 1.7 2005-07-31 10:04:10 bodea Exp $";
+char const *cvs_id_constants = "$Id: constants.c,v 1.8 2009-12-08 14:49:28 bodea Exp $";
 
 #include <stdio.h>
 #include "constants.h"
@@ -197,7 +197,8 @@ CONSTANT(radius_state,
     "RADIUSSTART",					// 3
     "RADIUSSTOP",					// 4
     "RADIUSINTERIM",					// 5
-    "RADIUSWAIT"					// 6
+    "RADIUSWAIT",					// 6
+    "RADIUSJUSTAUTH"					// 7
 )
 
 CONSTANT(radius_code,