fix control-in

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
add qemu-system-common.links for OVMF.fd

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
add qemu-slof to Suggests for ubuntu

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>