Change default => is_default

This change fixed issue related with wrong parameter naming
for public network

Change-Id: I284500f1befc963a6703a80a8c5de55ddf22d8c6
Related-prod: PROD-23295 PROD-23298
diff --git a/neutron/client/service/public.yml b/neutron/client/service/public.yml
index 532a8cf..a452c9c 100644
--- a/neutron/client/service/public.yml
+++ b/neutron/client/service/public.yml
@@ -11,7 +11,7 @@
               tenant: admin
               shared: False
               router_external: True
-              default: True
+              is_default: True
               admin_state_up: True
               provider_network_type: flat
               provider_physical_network: physnet1