Fallback for qemu-kvm
Fallback for qemu-kvm

In case when qemu-kvm-rhev is not available (RDO), packstack should fallback
to qemu-kvm package.

Change-Id: I5d41a1db1f613e6c153ff02eaf13f1b6c4f0f48a

xbezdick/packstack,palmer159/openstack-test,stackforge/packstack,xbezdick/packstack,openstack/packstack,fr34k8/packstack,openstack/packstack,xbezdick/packstack,stackforge/packstack,palmer159/openstack-test,fr34k8/packstack,imcsk8/packstack,openstack/packstack,imcsk8/packstack,mahak/packstack,palmer159/openstack-test,imcsk8/packstack,mahak/packstack,mahak/packstack,stackforge/packstack,fr34k8/packstack