Remove auto_install on fetchmail_attach_from_folder

The key 'active' is deprecated and is a synonym for 'auto_install'.
This addon should not be automatically installed.

fetchmail_attach_from_folder/__openerp__.py

@@ -35,5 +35,5 @@
         'security/ir.model.access.csv',
     ],
     'installable': True,
-    'active': True,
+    'auto_install': False,
 }