docker.io package reports missing only on EC2
Turns out jessie removed docker.io today and not all repos had updated when I did these experiments. To make things extra confusing, http.docker.net is really a broker service that sends you to other mirrors so EC2 was seeing one, up to date, mirror while my local box was seeing a mirror that still had docker.io available.
Package history: https://packages.qa.debian.org/d/docker.io.html