virtualization script does not support POWER8NVL

[Mike Rushton]

The KVM virtualization script /usr/lib/plainbox-provider-checkbox/bin/virtualization does not support Power8NVL cpu type. This is due to the script assuming POWER8 when passing qemu the parameters for a ppc architecture.

This is related to the following bug.
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1656112

[Mike Rushton (leftyfb)]

The specific lines in /usr/lib/plainbox-provider-checkbox/bin/virtualization are

   'ppc64el': {
        'cloudimg_type': CLOUD_IMAGE_TYPE_DISK,
        'cloudimg_arch': 'ppc64el',
        'qemu_bin': 'qemu-system-ppc64',
        'qemu_disk_type': QEMU_DISK_TYPE_VIRTIO,
        'qemu_extra_args': [
            '-enable-kvm',
            '-machine', 'pseries,usb=off',
            '-cpu', 'POWER8',
        ],