whislist : install packages qemu-guest-agent

hi, and thanks everybody for making systemrescueCD such a gem.

I would like qemu-guest-agent to be installed by default and launch at boot, so VM in kvm like hypervisor (or proxmox or libvirt) would be able to be driven by external programs or scripts.

this is very convenient when troubleshooting VM run in KVM/proxmox or like.