Note, there is something weird with those images, as the will segfault
on the first run (I've checked that with latest Debian 11 images, maybe
it will change in the future), so there is forced reboot after certain
amount of time as a workaround.
Till now, boxpy was based on the fact, that there was power_state
section, and there was a check if VM is down already. That approach have
their own issues.
Now, there will be no more power-off, there is a check by using
`cloud-init status` command through ssh.
Cleanup/destroy parts has needed some modification, so that there will
be no leftovers from cloud init ISO image.
And finally, there was some tweaks for user-data cloud-init part (mainly
for ssh handling), so that `cloud-init status` will not report phony
errors.
