Added a tool that prints the Hive username and password from inside a…

[georgepachitariu]

I'm storing this pull request here because I prefer to have another pull-request merged first:
jcrist#210 (afterward I would like to merge this as well to the original skein project)

The context: I would like to be able to connect to Hive using a pure-python library (PyHive) and authenticate with the Hive Delegation Token.

The problem: The Hadoop delegation token file is written in Hadoop Text format(gihub-link1, stackoverflow-link1)

I would like to have a small tool based on the same idea as the gihub-link1 repo above as part of the skein library.
The alternative is re-implementing a File Reader in Python. That is a big effort that I would like to avoid.

I think that this approach is similar to PySpark. There there is a connection (gateway) between the Python program and the one running on JVM. (I couldn't find the code that gets the credentials through the gateway, but I can look again.)

I wrote the code with a self-centered view, only addressing my specific problem because to me it looks like each database has its own way of authenticating and I didn't spend the time to read&understand all of them to be able to write a generic tool here. I assume that this code will evolve to be more generic in the future.

As always I appreciate any feedback.

[georgepachitariu]

In case anyone finds this page.
The solution in this pull-request works.
However, we decided to use Pyspark in my company which has this step already implemented.