streamLayeredImage: add dynamic tagging of docker image (#329425)

* streamLayeredImage: self-document the script

'podman load' doesn't let me override the name/tag from the image.
This name and tag is dynamic and in a CI environment so I would like to
be able to adjust the tag dynamically.
Since the image is streamed by stream_layered_image.py, there is no need
to stick with the nix-hardcoded image name/tag: the python script can
accept another name

I've added argparse to expose the feature. It has the added benefit of
adding `--help` support to the script, which makes its usage
self-explanatory.

* blackified file

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