We set the default kernel command-line arguments to tell systemd to spawn a debug shell on the serial console, instead of the default getty. This will allow tests to run commands directly on the console, without any authentication, etc.
So we can set `terminfo dumb` and hopefully get better output over the serial console.
In order to test AimeeOS A/B filesystem updates, we need a full disk image just like the Raspberry Pi variant has.
