Set external_router to false

Change-Id: I612a468b58e5ce1457f1f813ba272ead52e71fc7
Related-Prod: PROD-19000
diff --git a/metadata/service/tempest/neutron.yml b/metadata/service/tempest/neutron.yml
index a4bcce7..1d571dc 100644
--- a/metadata/service/tempest/neutron.yml
+++ b/metadata/service/tempest/neutron.yml
@@ -7,8 +7,7 @@
             heat-net:
               tenant: admin
               shared: False
-              router_external: True
-              default: True
+              router_external: False
               admin_state_up: True
               subnet:
                 heat_subnet: