Once the Sahara related code moved to Sahara repo and used, we can
remove Sahara specific code from Devstack.
Partial-Implements: bp sahara-devstack-intree
Change-Id: I34412b5cb2e86944b8555b8fd04b43556eb2bbe6
Depends-on: I2e00b2ebc59dd3be6a0539dea2985f2e801a1bd7
Depends-on: I07c3fede473030e8a110cbf5a08309f890905abf