Add placement_service_host default to nginx proxy

Change-Id: Icb10f3cf30e24341bbcccd8c84838b3f04f16e34
Related-Prod: PROD-27061
diff --git a/nginx/server/proxy/openstack/placement.yml b/nginx/server/proxy/openstack/placement.yml
index a54966e..cb88a6d 100644
--- a/nginx/server/proxy/openstack/placement.yml
+++ b/nginx/server/proxy/openstack/placement.yml
@@ -1,5 +1,6 @@
 parameters:
   _param:
+    placement_service_host: ${_param:nova_service_host}
     nginx_proxy_openstack_api_host: ${_param:cluster_public_host}
     nginx_proxy_openstack_api_address: 0.0.0.0
     nginx_proxy_openstack_placement_host: ${_param:placement_service_host}