Update for deployement compliance

In order to perform the deployement I updated few things. All python
commands are replaced with python3 to force the use of them.
I updated as well the SQL migration path to ensure that it will be run
wherever the script is executed.
Signed-off-by: Matthieu Berjon <matthieu.berjon@inria.fr>

django/tools/migration.sh

@@ -9,6 +9,7 @@ DJANGO_TABLES="dj_docker_os dj_webapps dj_webapp_parameters dj_webapp_versions \
   auth_group_permissions auth_permission auth_user auth_user_groups \
   auth_user_user_permissions django_admin_log django_content_type \
   django_migrations django_session"
+CUR_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
 
 ParseArgs () {
@@ -54,12 +55,12 @@ LoadDb () {
   rm -rf poc/migrations
 
   # Apply the migration
-  mysql -u $USER $PASS -h $HOST $DB< tools/migration2django.sql
+  mysql -u $USER $PASS -h $HOST $DB< $CUR_DIR/migration2django.sql
   
   # Tell Django to use the current status of the database and start the migrations
   # from that point
-  python manage.py makemigrations auth poc
-  python manage.py migrate --fake
+  python3 manage.py makemigrations auth poc
+  python3 manage.py migrate --fake
 }