erp5_certificate_authority: Change default reference to be specific

  Use specific reference reduces the confusion on what default means, since we
  can have multiple connectors for multiple purposes one day.

bt5/erp5_certificate_authority/MixinTemplateItem/portal_components/mixin.erp5.CertificateLoginMixin.py

@@ -55,7 +55,7 @@ class CertificateLoginMixin:
     portal = self.getPortalObject()
     connector_list = portal.portal_catalog.unrestrictedSearchResults(
       portal_type="Caucase Connector",
-      reference="default",
+      reference="erp5-certificate-login",
       validation_state="validated"
     )
     if len(connector_list) == 0:

product/ERP5Type/tests/ERP5TypeCaucaseTestCase.py

@@ -139,7 +139,7 @@ class ERP5TypeCaucaseTestCase(ERP5TypeTestCase):
       test_caucase_connector = portal_web_service.newContent(
         id="test_caucase_connector",
         portal_type="Caucase Connector",
-        reference="default",
+        reference="erp5-certificate-login",
         user_key=None,
         user_certificate=None
       )