Imported Upstream version 2.1.21

THANKS

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+A list of people who have contributed to the development of L2TPNS
+by reporting problems, suggesting various improvements or submitting
+actual code follows.
+
+Adrian Kennard             <adrian.kennard@aaisp.net.uk>
+David Parrish              <dparrish@gmail.com>
+Michael O'Reilly           <michael@optus.net>
+Brendan O'Dea              <bod@optus.net>
+Bradley Baetz              <bradley.baetz@optus.net>
+Iain Wade                  <iwade@optus.net>
+Yuri                       <yuri@actcom.net.il>
+Juergen Kammer             <j.kammer@eurodata.de>
+Simon Talbot               <simont@nse.co.uk>
+Jonathan McDowell          <noodles@earth.li>
+Bjørn Augestad             <augestad@users.sourceforge.net>
+Roberto Chostakovis        <rchostakovis@users.sourceforge.net>
+Jordan Hrycaj              <jordan@mjh.teddy-net.com>
+Vladislav Bjelic           <vladislav@gmail.com>
+Alex Kiernan               <alex.kiernan@gmail.com>
+Dominique Rousseau         <d.rousseau@nnx.com>
+Tim Devries                <tdevries@northrock.bm>
+Slobodan Tomic             <stomic@loznica.com>
+Michael Chapman            <mike.chapman@optus.net>
+Charlie Brady              <charlieb@e-smith.com>
+Jon Morby                  <jon@fido.net>
+Paul Martin                <pm@zetnet.net>
+Jonathan Yarden            <jyarden@bluegrass.net>
+Patrick Cole               <z@amused.net>
+Rhys Kidd                  <rhys.kidd@staff.westnet.com.au>