Little sidecar that create `<containername>.test` entry in case a port is EXPOSEd

[ChristianKniep]

A reminder to myself to create a little container that accesses /var/run/docker.sock locally and reacts on container create hooks to check if there is a port exposed (or mapped) and creates a file in .candy for each mapping.

Goal is to have an automagic local DNS entry available for each container that was started on my macbook. :)