- Introduce a new parameter, CONFIG_NOVA_LIBVIRT_VIRT_TYPE where
someone can forcefully use either 'qemu' or 'kvm' while still
maintaining the default to 'qemu' for virtual environments and
'kvm' for bare metal servers
- Remove the qemu-kvm-ev detection. If qemu-kvm-ev is available,
it will be installed since it osboletes qemu-kvm.
- Improve the workaround for the /dev/kvm permissions fix
Change-Id: I87ea47cde3e02cfa5f3a26cacf010a18c29083b5