Restarting system after updating services

[andrewn]

After updating service list, the setup services says "Service changes have been saved. Restart the device for changes to take effect."

I'm wondering how best to support this:

• user could cycle the power (but this is a bit dangerous)
• add a button to the setup service to reboot
• user has to ssh into the Pi and execute sudo reboot
• have a way of start/stopping correct services without rebooting

[pixelblend]

There's currently no link between service's directory name and systemd service name. If we could enforce this, then we could emit systemd commands to stop / start the requried services.