Separate or rename python3 package

[bengerman13]

The python3 package in this release includes more than just python3 - it also includes the python package requests
This creates a collision for us, as we vendor python3 to other packages on the same host.

It would be nice if the python3 package was either renamed, or if the dependency of python3 was separated from the python package dependencies.

If it helps, we've done similar work on this here: cloud-gov/logsearch-for-cloudfoundry#29. (I can submit a PR, but most of the changes are in the blobstore, and you all will get different blob IDs than we did, so I'd need some help sorting that out) [Edit: there was more work than just the one PR, but the PR linked shows the basic outline, and the rest of the work is pretty obvious by looking at our repo and the other commits made today]