def export_disks(self, standalone, dst_dir, compress, *args, **kwargs):
pass<EOL>
Export 'disks' as a standalone image or a layered image.
Args:
    disks(list): The names of the disks to export
      (None means all the disks)
    standalone(bool): If true create a copy of the layered image
      else create a new disk which is a combination of the current
      layer and the base disk.
    dst_dir (str): dir to place the exported images
    compress (bool): if true, compress the exported image.