Initial Release of HadoopStack Hadoop cookbook

This coobook is a wrapper to the hadoop cookbook available here
https://github.com/siel-iiith/hadoop-cookbook

and contains HadoopStack specific changes.

It has two recipes - slave and master. The motivation has been to
avoid roles as much as possible and make the recipes self-dependent
through discovery of services.

Signed-off-by: Shashank Sahni <shredder12@gmail.com>