Renamed all swift-dependent configs to sahara

* Fixed swift helper and 'conf-template.xml' with
  'service.savanna' to 'service.sahara'
* Also fixed configs in HDP plugin
* Integration and unit tests are fixed as well

Change-Id: I611d2200e3cb8071f97fca67a9528388b8b18798
Partially implements: blueprint savanna-renaming-service
Merge "Renamed all swift-dependent configs to sahara"