Added basic helper for map-reduce actions

* Added mapreduce action
* It doesn't include streaming and pipes actions
* Refactored base_workflow creator to hide common methods
* Unit-test added

Implements blueprint edp-oozie-workflow-creator

Change-Id: Iabb03f93ff0eacd875b471646afdc0f65aebc416
Merge "Added basic helper for map-reduce actions"