Use python to zombiekill

[yuvipanda]

This gives us more options on how to actually kill,
and do it better.

I suggest running this python code locally to tune it,
and copy paste it back here when it works the way
you would like it to.

Note that there was a typo here (us-central instead of us-central1)
that I corrected.

[jbusecke]

Thank you so much @yuvipanda. Just tested it locally

This seems much better than before (for the case of no jobs present). Ill put this in production and keep an eye out for when we have some zombies coming up again.

[yuvipanda]

@jbusecke glad you like it :) Yeah, if it runs into issues, much easier to see the exact error, and use our general python skills to handle them! Much easier than forcing it onto bash.