Ensure service is restarted on unit file changes

At the moment we don't restart services if systemd unit file is changed.

We knowingly prevent systemd_service role handlers to execute
by providing `state: started` as otherwise service will be restarted twice.
With that now  we ensure that role handlers will also listen for systemd
unit changes.

Depends-On: https://review.opendev.org/c/openstack/openstack-ansible/+/879671
Change-Id: I8140add1a4e4fdacee89bd29bd2e3c87eff0953a

handlers/main.yml

@@ -27,6 +27,7 @@
   listen:
     - "Restart cinder services"
     - "venv changed"
+    - "systemd service changed"
 
 - name: Start services
   service:
@@ -42,6 +43,7 @@
   listen:
     - "Restart cinder services"
     - "venv changed"
+    - "systemd service changed"
 
 - name: Ensure tgt service restarted
   service:

tasks/cinder_install.yml

@@ -55,22 +55,7 @@
     systemd_BlockIOAccounting: true
     systemd_MemoryAccounting: true
     systemd_TasksAccounting: true
-    systemd_services: |-
-      {% set services = [] %}
-      {% for service in filtered_cinder_services %}
-      {%
-        set _ = service.update(
-          {
-            'enabled': 'yes',
-            'state': 'started',
-            'config_overrides': cinder_environment_overrides | combine(service.init_config_overrides, recursive=True)
-          }
-        )
-      %}
-      {%   set _ = service.pop('init_config_overrides') -%}
-      {%   set _ = services.append(service) -%}
-      {% endfor %}
-      {{ services }}
+    systemd_services: "{{ filtered_cinder_services }}"
   tags:
     - cinder-config
     - systemd-service

vars/main.yml

@@ -34,7 +34,15 @@ filtered_cinder_services: |-
           (('condition' not in value) or
            ('condition' in value and value['condition'])) and
            not ('wsgi_app' in value and value['wsgi_app']) %}
-  {%     set _ = value.update({'service_key': key}) %}
+  {%     set _ = value.update(
+            {
+              'service_key': key,
+              'enabled': value['enabled'] | default(True),
+              'state': value['state'] | default('started'),
+              'config_overrides': cinder_environment_overrides | combine(value.init_config_overrides, recursive=True)
+            }
+          ) %}
+  {%     set _ = value.pop('init_config_overrides') -%}
   {%     set _ = services.append(value) %}
   {%   endif %}
   {% endfor %}