refactoring

modoboa_installer/scripts/base.py

@@ -161,6 +161,10 @@ class Installer(object):
         """Tasks to execute before the installer starts."""
         pass
 
+    def restore(self):
+        """Tasks to execute to restore files/databases."""
+        pass
+
     def post_run(self):
         """Additionnal tasks."""
         pass