Since https://review.openstack.org/#/c/438325 landed
it only works for Centos 7, but not for other
RHEL-based distributions: Virtuozzo and, probably, RHEV.
Both of above have own version for qemu-kvm package: qemu-kvm-vz and qemu-kvm-rhev,
accordingly. These packages provide "qemu-kvm", like qemu-kvm-ev,
and, when you call "yum install qemu-kvm", they replace the default OS package.
Change-Id: I46da627c0da8925064862fdc283db81591979285
008aa3e095