Add also_notifies to Infoblox backend for Designate

Change-Id: Ia02f83dfaaba53f95e373b2b2be3f74cfb7ae578
Closes-Bug: #1855085

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

@@ -65,6 +65,11 @@
 {% for host in designate_backend_infoblox_nameservers.replace(" ", "").split(',') %}
     - host: {{ host }}
       port: {{ designate_bind_port }}
+{% endfor %}
+  also_notifies:
+{% for host in designate_backend_infoblox_nameservers.replace(" ", "").split(',') %}
+    - host: {{ host }}
+      port: {{ designate_bind_port }}
 {% endfor %}
   targets:
     - type: infoblox

releasenotes/notes/designate-infoblox-backend-also-notifies-0214cc1e51b838b8.yaml

+---
+fixes:
+  - |
+    Adds configuration to set `also_notifies` within the pools.yaml file
+    when using the Infoblox backend for Designate.
+
+    Pushing a DNS NOTIFY packet to the master does not cause the DNS update
+    to be propagated onto other nodes within the cluster. This means each node
+    needs a DNS NOTIFY packet otherwise users may be given a stale DNS record
+    if they query any worker node. For details please see
+    `bug 1855085 <https://bugs.launchpad.net/kolla-ansible/+bug/1855085>`__