Enable data locality for HDP plugin

Enabled the savanna data locality features for the HDP plugin.  The
HDP plugin makes use of the topology_helper to create the required
configuration for rack awareness.  This initial implementation assumes
that enabling the feature for the server implies that all clusters
will leverage the capability.

Implementes blueprint hdp-support-data-locality

Change-Id: I12bc5c064baff36c9630a4c48128f97c014fd537
Merge "Enable data locality for HDP plugin"