In some cases it will not boot without a console, and the CI framework
defaults to using serial console. So set it on live-iso, qcow2, and the
final iso installed with liveimg.
Related: rhbz#1770193
passwd and openssh-clients need to be installed, and there is no need to
use sudo when you are connecting to the system as root.
Cherry-picked from 454af0c5d5
Related: rhbz#1770193
Use anaconda to install the root.tar.xz into a disk image. Copy the
disk image to the host, and use the cockpit vm support to boot it and
test it.
Cherry-picked from 4705ff3b1e
Related: rhbz#1770193
