Modify designate bind pool config to match proxied endpoints

The miniDNS servers are now proxied behind ports on the the
public network to allow integration with external DNS
services.

Depends-On: https://review.opendev.org/c/openstack/tripleo-heat-templates/+/848878
Depends-On: https://review.opendev.org/c/openstack/puppet-tripleo/+/848733
Change-Id: Ie94defbfbb2021e6014bf25aa0fabe7f8cac2175
(cherry picked from commit 8079f13df6)

tripleo_ansible/roles/designate_bind_pool/templates/pools.yaml.j2

@@ -41,8 +41,8 @@
       # patch.
       masters:
         {% for minidns_server in designate_mdns_node_ips -%}
-        - host: {{ minidns_server }}
-          port: 5354
+        - host: {{ net_vip_map[service_net_map['public_network']] }}
+          port: {{ minidns_proxy_base_port + loop.index -1 }}
         {% endfor %}
 
       # BIND Configuration options