Add CDH plugin to Sahara

Features:
* cluster provisioning
* scaling
* edp
* validation
* swift support

TODO (in other CRs):
* unit tests
* integration tests
* data locality

partially implement: blueprint cdh-plugin

Change-Id: Ie231c434d61ba9a379a6ee2fd0f0bf2af21ce44d
Merge "Add CDH plugin to Sahara"