[WIP] Splitting Docker components out further.

The culling script is now a separate service. I'm not sure how to break out `script/dev` now. With this change and others coming to our Docker layer, I'll be able to have what are really four components in separate Docker containers:

* Culler
* DockerService
* UserShufflerOrchestrationNamingIsHard
* Config proxy (**Bonus points**: Already containerized, works with this already)