code: def import_task(self, img, cont, img_format=None, img_name=None):
          
          return self._tasks_manager.create("import", img=img, cont=cont,
                  img_format=img_format, img_name=img_name)
docs: Creates a task to import the specified image from the swift container
          named in the 'cont' parameter. The new image will be named the same as
          the object in the container unless you specify a value for the
          'img_name' parameter.
  
          By default it is assumed that the image is in 'vhd' format; if it is
          another format, you must specify that in the 'img_format' parameter.