Setup versionless endpoint in admin_identity

Change-Id: I3104286eed22ef91855cc92c7d707361fdfd2da9
diff --git a/metadata/service/tempest/init.yml b/metadata/service/tempest/init.yml
index bb9b7a0..35e48b0 100644
--- a/metadata/service/tempest/init.yml
+++ b/metadata/service/tempest/init.yml
@@ -44,6 +44,9 @@
             region_name: ${_param:openstack_region}
             use_keystoneauth: true
             protocol: ${_param:keystone_service_protocol}
+            api_version: ''
+            user_domain_name: 'Default'
+            project_domain_name: 'Default'
   runtest:
     enabled: true
     openstack_version: stable/${_param:openstack_version}