[IMP] test utils: don't ACL-protect repos by default

This is quite frustrating when trying to access the frontend from a
test especially combined with the lack of in-log feedback (before the
previous commit).

mergebot_test_utils/utils.py

@@ -158,6 +158,7 @@ def make_basic(
         'name': prod.name,
         'required_statuses': statuses,
         'fp_remote_target': other.name if other else False,
+        'group_id': False,
     })
     env['res.partner'].search([
         ('github_login', '=', config['role_reviewer']['user'])