Added explicit GPL2 license text to the python module code files.

python/fkomodule.c

@@ -9,6 +9,23 @@
  *  Copyright (C) 2009-2015 fwknop developers and contributors. For a full
  *  list of contributors, see the file 'CREDITS'.
  *
+ *  License (GNU General Public License):
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version 2
+ *  of the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
+ *  USA
+ *
  *****************************************************************************
 */
 #include <Python.h>