Setup credential related system preference.

Vifib uses erp5_credential and have to be configured.

master/product/Vifib/tests/VifibMixin.py

@@ -183,6 +183,11 @@ class testVifibMixin(ERP5TypeTestCase):
     """Configures and enables default system preference"""
     default_system_preference = self.portal.portal_preferences\
         .restrictedTraverse(self.getDefaultSitePreferenceId())
+    default_system_preference.edit(
+      preferred_credential_recovery_automatic_approval=1,
+      preferred_credential_request_automatic_approval=1,
+      preferred_subscription_assignment_category=['function/customer'],
+    )
     if default_system_preference.getPreferenceState() == 'disabled':
       default_system_preference.enable()