WIP.  Robot account proposal.

In a rough state but putting out for comment.

There has been considerable discussion about the general problem of secret distribution for docker and kubernetes.
While that is a great goal, I think it will take some time.
In the shorter term, I want to be able to just distribute secrets for access to the kubernetes API.
This proposal just focuses on that.

That problem is important to solve because:
  - it lets us run scheduler and controller-manager via /pods
  - lets users write their own services, like cron, build controllers, etc, more easily.
  - gets us closer to self-hosting.
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