These are similar to the existing simple headless guests, but
also include a graphical output and some input devices.

Input files were generated by running

  $ virt-install \
    --name guest --os-variant fedora29 \
    --vcpus 4 --memory 4096 --disk size=5 \
    --graphics vnc \
    --print-xml

followed by minor tweaks.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NCole Robinson <crobinso@redhat.com>