qcow2: Change default for new images to compat=1.1
By the time that qemu 1.7 will be released, enough time will have passed since qemu 1.1, which is the first version to understand version 3 images, that changing the default shouldn't hurt many people any more and the benefits of using the new format outweigh the pain. qemu-iotests already runs with compat=1.1 by default. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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