Find a way to apply the configuration without rebooting

[David-Gil]

Find a way to apply the configuration without using Nerves.Runtime.reboot/0

[tmecklem]

I think we could achieve this by using the Nerves SystemRegistry. This needs some research if anyone has the time to dig into https://github.com/nerves-project/system_registry. (It's already used in the project by nerves_network)