Handle systemd service file changes / reloads correctly

[tayzlor]

At the moment if you change a .service file and try and restart the service you'll receive a warning like -

Warning: marathon.service changed on disk. Run 'systemctl daemon-reload' to reload units.

Running systemctl daemon-reload and then systemctl restart marathon fixes that - we just need to build that into the ansible playbooks

[enxebre]

we could try to ensure enabled (not started) for every service on tasks and only start them by notifying reload-daemon restart-service