Fix designate proxy in os-ha-ovs

This patch adds nginx configuration for designate on proxy node. This
allows to get to designate api by public endpoint.

Change-Id: Ibaefb26f02c687f67e687a1001a41a7305101dc6
Related-Prod: https://mirantis.jira.com/browse/PROD-16624
diff --git a/classes/cluster/os-ha-ovs/openstack/init.yml b/classes/cluster/os-ha-ovs/openstack/init.yml
index 2f74ab9..da3da94 100644
--- a/classes/cluster/os-ha-ovs/openstack/init.yml
+++ b/classes/cluster/os-ha-ovs/openstack/init.yml
@@ -123,6 +123,7 @@
     horizon_identity_host: ${_param:cluster_vip_address}
     horizon_identity_encryption: none
     horizon_identity_version: 2
+    nginx_proxy_openstack_api_proxy_host: ${_param:cluster_vip_address}
   linux:
     network:
       host: