Add a Makefile for generating an openshift-spark based on py s2i

[tmckayus]

The point of this Makefile is to make it easy to generate an openshift-spark image with a python s2i builder image as as base, without having to manually maintain a duplicate docker file. This alternate image has full support for building pyspark applications which can be passed to spark-submit, or python applications that invoke spark-submit, or ...

[tmckayus]

WIP, I need to add a README.md explaining what this does and how to use it.

In a nutshell, it copies the build from the parent (openshift-spark), changes the base image, and makes a new image. It's the best idea I had for keeping the spark version specified in one place but still pulling s2i in as a base (this image in turn will be a base for other images most likely that do something with spark-submit to launch an application).

Note, to have a similar openshfit-spark image with a different builder base (example, java), a sibling directory would be made with a similar (almost identical?) Makefile specifying a java builder base.

[tmckayus]

Now of course there is always the possibility of some kind of complex generator script or image, but this seemed like a simple way to fill the need at present.

[tmckayus]

Oh, I also changed the subdir name to match the image

[elmiko]

lgtm +1