Using console focused virtualization environments such as virsh having
a serial console is the easiest way to interact with a virtual machine.
It also saves resources since no video memory needs to be allocated.
Enable serial console besides tty1 by default.
Note: The bootloader as well as the kernel shows its boot messages on
all consoles. However, only the last console is mapped to /dev/console,
which systemd is using to show service startup messages. Putting tty1 as
last console makes sure that systemd messages are still shown on the
console screen.