Added Sahara Clusters scenario

The scenario creates and deletes a Hadoop cluster.

Change-Id: I1280f5f3f4cd7415788a3e474dd1852c68a3c35c
Merge "Added Sahara Clusters scenario"
Update the scenario_base to base in benchmarks

Keep the scenario_base only on places where required.
Rest keep it as base instead of scenario_base

Change-Id: Ib7887c0a0b65d67a814222e0786fc228cd5bd2ca
refactoring rps runner unit tests

Change-Id: I36d4fa91cfc96769087011f56a848e5987bdba24