Make use of Maven Shade for some dependency conflicts

[imedina]

Hadoop stable version has some old dependencies. HPG BigData versions of Avro and Guava raise some errors. As shown by @tomwhite Maven Shade plugin can be used to fix this.

[tomwhite]

Here's an example of how I've done this before: https://github.com/kite-sdk/kite/blob/master/pom.xml#L617