[CentOS] Virtualization option at first install CentOS-5.4 x86_64

>
> Well, it turns out that qemu is required and kvm-qemu-img was the
> source of the problem.  Removing this and installing qemu instead
> fixed the problem.
>

Actually I did the other way round:
yum remove qemu (which is in the extras repo)
yum install -x qemu kvm (excluding qemu and thus kvm-qemu-img will be taken)

My idea was to test the official upstream vendor stuff and only this.