Adapting to use the python-saharaclient library

Changes to use python-saharaclient library which come as part
of the savanna to sahara renaming project.
*  This requires python-saharaclient to be released as
   requirements.txt now depends on it.

Partial-Implements:  blueprint savanna-renaming-dashboard

Change-Id: I0da5efb3f8398c3108ec51be5858951396cddca5
Changing configuration from SAVANNA to SAHARA

*Renaming configs from SAVANNA* to SAHARA* as part of the
rename process.
*Updating references to those configs in Sahara dashboard

Partial-Implements:  blueprint savanna-renaming-dashboard

Change-Id: Ie1923e5f6fdabfbae0287c6a0530dc649b71afc1
Merge "Adapting to use the python-saharaclient library"
Merge "Changing configuration from SAVANNA to SAHARA"