services: Merge some service templates

roles/services/tasks/power_mqtt.yaml

@@ -14,11 +14,14 @@
 
 - name: Install power-mqtt service
   template:
-    src: power-mqtt.service
+    src: generic.service
     dest: /etc/systemd/system/power-mqtt.service
     owner: root
     group: root
     mode: 0644
+  vars:
+    description: SMD630 to MQTT Probe
+    exec: /var/lib/power-mqtt.py
   notify: restart power-mqtt
 
 - name: Start power-mqtt