Add variable to globally control notifications enablement

In order to be able to globally enable notification reporting for all services,
without an need to have ceilometer deployed or bunch of overrides for each
service, we add `oslomsg_notify_enabled` variable that aims to control
behaviour of enabled notifications.

Presence of ceilometer is still respected by default and being referenced.

Potential usecase are various billing panels that do rely on notifications
but do not require presence of Ceilometer.

Depends-On: https://review.opendev.org/c/openstack/openstack-ansible-plugins/+/914144
Change-Id: Ia29caf1633d5467e870226763088065fde54f12d

defaults/main.yml

@@ -113,6 +113,7 @@ designate_oslomsg_rpc_ssl_ca_file: "{{ oslomsg_rpc_ssl_ca_file | default('') }}"
 designate_oslomsg_rpc_policies: []
 
 # Notify
+designate_oslomsg_notify_configure: "{{ oslomsg_notify_configure | default(designate_ceilometer_enabled) }}"
 designate_oslomsg_notify_host_group: "{{ oslomsg_notify_host_group | default('rabbitmq_all') }}"
 designate_oslomsg_notify_setup_host: >-
   {{ (designate_oslomsg_notify_host_group in groups) | ternary(groups[designate_oslomsg_notify_host_group][0], 'localhost') }}

tasks/main.yml

@@ -88,6 +88,7 @@
     _oslomsg_notify_transport: "{{ designate_oslomsg_notify_transport }}"
     _oslomsg_configure_notify: "{{ designate_ceilometer_enabled | bool }}"
     _oslomsg_notify_policies: "{{ designate_oslomsg_notify_policies }}"
+    _oslomsg_notify_configure: "{{ designate_oslomsg_notify_configure }}"
   tags:
     - always
 

templates/designate.conf.j2

@@ -36,7 +36,7 @@ rabbit_quorum_delivery_limit = {{ designate_oslomsg_rabbit_quorum_delivery_limit
 rabbit_quorum_max_memory_bytes = {{ designate_oslomsg_rabbit_quorum_max_memory_bytes }}
 
 [oslo_messaging_notifications]
-driver = {{ (designate_ceilometer_enabled | bool) | ternary('messagingv2', 'noop') }}
+driver = {{ (designate_oslomsg_notify_configure | bool) | ternary('messagingv2', 'noop') }}
 transport_url = {{ designate_oslomsg_notify_transport }}://{% for host in designate_oslomsg_notify_servers.split(',') %}{{ designate_oslomsg_notify_userid }}:{{ designate_oslomsg_notify_password }}@{{ host }}:{{ designate_oslomsg_notify_port }}{% if not loop.last %},{% else %}/{{ _designate_oslomsg_notify_vhost_conf }}{% if designate_oslomsg_notify_use_ssl | bool %}?ssl=1&ssl_version={{ designate_oslomsg_notify_ssl_version }}&ssl_ca_file={{ designate_oslomsg_notify_ssl_ca_file }}{% else %}?ssl=0{% endif %}{% endif %}{% endfor %}
 
 {% if designate_backend_ssl | bool %}