iotests: Add test for driver=qcow2, format=qcow2 While specifying a different driver and format is obviously invalid, specifying the same driver once through driver and once through format is invalid as well. Add a test for it. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-id: 1423162705-32065-5-git-send-email-mreitz@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>