Usage of systemd services is mapped to the host group

Previously all ceilometer services were deployed to all hosts.
But, notification agent is most cases has nothing to do with
nova-compute hosts. So condition has been added in order to
differentiate services based on their groups.

Change-Id: I7bf1a2ef605f6645aa10787b1a53e8a63034cead

defaults/main.yml

@@ -238,14 +238,14 @@ ceilometer_services:
   ceilometer-agent-notification:
     group:
       - ceilometer_agent_notification
-    init_config_overrides: "{{ ceilometer_agent_init_overrides }}"
+    config_overrides: "{{ ceilometer_agent_init_overrides }}"
     service_name: ceilometer-agent-notification
     execstarts: "{{ ceilometer_bin }}/ceilometer-agent-notification"
   ceilometer-polling:
     group:
       - ceilometer_agent_central
       - ceilometer_agent_compute
-    init_config_overrides: "{{ ceilometer_polling_init_overrides }}"
+    config_overrides: "{{ ceilometer_polling_init_overrides }}"
     service_name: ceilometer-polling
     execstarts: "{{ ceilometer_bin }}/ceilometer-polling"
 

tasks/main.yml

@@ -73,15 +73,16 @@
     systemd_BlockIOAccounting: true
     systemd_MemoryAccounting: true
     systemd_TasksAccounting: true
-    systemd_services:
-      - service_name: "{{ service_var.service_name }}"
-        enabled: yes
-        state: started
-        execstarts: "{{ service_var.execstarts }}"
-        config_overrides: "{{ service_var.init_config_overrides }}"
-  with_items: "{{ ceilometer_services.values() | list }}"
-  loop_control:
-    loop_var: service_var
+    systemd_services: |-
+      {% set services = [] %}
+      {% for service in ceilometer_services.values() %}
+      {%   if service.group | intersect(group_names) %}
+      {%     set _ = service.update({'enabled': 'yes', 'state': 'started'}) %}
+      {%     set _ = service.pop('group') %}
+      {%     set _ = services.append(service) %}
+      {%   endif %}
+      {% endfor %}
+      {{ services }}
   tags:
     - ceilometer-config
     - systemd-service