Apply haproxy_service_configs to hosts idempotently

add_host module always returns changed state which looks like
non-idempotent behaviour, while it's expected to be changed at all times.
changed_when: false added for idempotent behaviour.

Depends-On: https://review.opendev.org/c/openstack/openstack-ansible-os_nova/+/915320
Change-Id: Ia2862e9883f1c972efdb40576e55dfe828c3a424
(cherry picked from commit 46a69a26a1)

playbooks/haproxy_service_config.yml

@@ -31,6 +31,7 @@
         name: "{{ item }}"
         haproxy_service_configs: "{{ hostvars[inventory_hostname][service_variable] }}"
       with_items: "{{ groups['haproxy_all'] }}"
+      changed_when: False
 
 - hosts: haproxy_all
   serial: "{{ haproxy_serial | default('50%') }}"