Search for BlueOS vehicles in the network and let the user choose between them

[rafaellehmkuhl]

In the Electron version, it's possible to access the network-interface data, and with it knock every IP on the subnet, looking for BlueOS vehicles.

Knowing which vehicles are in the network allows Cockpit to show the options to the user, letting them choose on which vehicle to connect, or even let them know that there are no vehicles available in the network.

This has the potential to deeply increase the first user experience, automatically connecting them to their vehicle, which is usually where new users struggle.