Adding IDH plugin basic implementation

Functionality:

* install and provision Intel Hadoop Manager and Intel Hadoop
* configure Intel Hadoop to use Cinder volumes as HDFS backend
* manual cluster scaling support
* Swift integration
* cluster configs - the same configs as in Vanilla Hadoop
* configs validation - the same as in Vanilla plugin

This is initial version. It doesn't cover bugs filed here:
https://bugs.launchpad.net/savanna/+bugs?field.searchtext=%7BIDH%5D

Co-Authored-By: Andrew Lazarev <alazarev@mirantis.com>

Implements blueprint idh-savanna-plugin

Change-Id: I70363869b61d73222d247b566d499c2fd6fb9201
Merge "Adding IDH plugin basic implementation"