
Previously Nova only checked the minimum required libvirt version. It should also be checking for a minimum required QEMU version. This picks QEMU version 1.5.3, since that is the oldest QEMU version that exists in the distros that include the minimum libvirt version 1.2.1. No decision is made about a "next" QEMU version at this time. Change-Id: Ie9413338a2422cc876f48c5c477eb3cd0ffb13ec