Change listen for mdns

The service listening port of MDNS can be override by dns_interface.
If so, the pool conf use the wrong IP for join mdns service.

Change-Id: I8a3678955ecf5f769da7090fe5dad68e027c102b

ansible/roles/designate/templates/pools.yaml.j2

@@ -25,8 +25,8 @@
       description: BIND9 Server {{ hostvars[bind_host]['ansible_' + hostvars[bind_host]['api_interface']]['ipv4']['address'] }}
       masters:
 {% for mdns_host in groups['designate-mdns'] %}
-        - host: {{ hostvars[mdns_host]['ansible_' + hostvars[mdns_host]['api_interface']]['ipv4']['address'] }}
-          port: 5354
+        - host: {{ hostvars[mdns_host]['ansible_' + hostvars[mdns_host]['dns_interface']]['ipv4']['address'] }}
+          port: {{ designate_mdns_port }}
 {% endfor %}
       options:
         host: {{ hostvars[bind_host]['ansible_' + hostvars[bind_host]['api_interface']]['ipv4']['address'] }}
@@ -41,8 +41,8 @@
       description: BIND9 Server {{ bind_host }}
       masters:
 {% for mdns_host in groups['designate-mdns'] %}
-        - host: {{ hostvars[mdns_host]['ansible_' + hostvars[mdns_host]['api_interface']]['ipv4']['address'] }}
-          port: 5354
+        - host: {{ hostvars[mdns_host]['ansible_' + hostvars[mdns_host]['dns_interface']]['ipv4']['address'] }}
+          port: {{ designate_mdns_port }}
 {% endfor %}
       options:
         host: {{ bind_host }}

releasenotes/notes/add-designate-bind-mdns-123e79587bb06072.yaml

+---
+fixes:
+  - Change the service listening port of MDNS by dns_interface.