Docker image tags based on kafka version

[rmelick]

It would be awesome if the docker image had more tags than just "latest". How difficult would it be for there to be different tags for different versions? I'm working with some other systems to do not yet support kafka 0.10.

[bluepuma77]

I agree, it would be great to have an old image with kafka 0.8 still available on docker hub.

[catkins]

Would also love this, 0.9 specifically

[NeQuissimus]

This is indeed keeping us from using the Spotify image right now, as we need reproducible builds.