Feature Request: some API should support image list as args

For example, you can use

docker save -o images.tar.gz docker.example.com/images/{image1,image2}:latest

to save multi docker at one time ( docker source code )

However, docker-py do not support multi images as API args.

I write one by my self,

class ImageApiMixin(object):
    ......
    def get_image(self, images):
        images_query = "?names=" + "&names=".join(images)
        res = self._get(self._url("/images/get" + images_query), stream=True)
        self._raise_for_status(res)
        return res.raw

so I can use

client.get_images([image1, image2])

to save multi images to one file.

Start with the ImageApiMixin.get_image example and the client.get_images([image1, image2]) usage described in the issue. Trace how image retrieval arguments are currently passed, then make multi-image input work through the API and verify that multiple images can be saved to one file.