Added GPL headers on generate-demo.sh script

tools/generate-demo.sh

@@ -1,4 +1,16 @@
 #! /bin/bash
+# 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 3 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, see <https://www.gnu.org/licenses/>.
 
 function create_targetgroups(){
 	passhport-admin targetgroup create network-switches --comment "Ensemble des switches de l'entreprise"