Add missing declaration of kolla_enable_hacluster

Story: 2010069
Task: 45540
Change-Id: I0658c0059867468d6032cb1bfa3d05ae0d01c422

ansible/group_vars/all/kolla

@@ -535,6 +535,7 @@ kolla_enable_fluentd: "yes"
 kolla_enable_freezer: "no"
 kolla_enable_gnocchi: "no"
 kolla_enable_grafana: "{{ kolla_enable_monasca | bool }}"
+kolla_enable_hacluster: "no"
 kolla_enable_heat: "{{ kolla_enable_openstack_core | bool }}"
 kolla_enable_horizon: "{{ kolla_enable_openstack_core | bool }}"
 kolla_enable_influxdb: "{{ kolla_enable_monasca | bool or kolla_enable_cloudkitty | bool }}"

releasenotes/notes/fix-hacluster-variable-48d1370651a11cda.yaml

+---
+fixes:
+  - |
+    Fixes an issue with undefined kolla_enable_hacluster variable.