Workaround docker 1.2 not handling transfer-encoding:chunked

The container start command body gets ignored when the
transfer encoding is chunked.

Issue: #90
Improve the unit test for NetCat

We don't really care if the port is opened by docker,
we only care that docker SAYS it opened it.

This also didn't appear to work anyway because no binding was provided.
Merge pull request #4 from thomassuckow/docker1_2

Docker 1.2 Workaround