Remove sourcing of lib/sahara
Remove sourcing of lib/sahara

We're going to move Devstack code to the Sahara repo and Grenade
support will be done as a in-tree plugin as well.
Currently this sourcing is just a no-op.

Partial-Implements: bp sahara-devstack-intree

Change-Id: I07c3fede473030e8a110cbf5a08309f890905abf
dtroyer/grenade,dtroyer/grenade,openstack-dev/grenade,openstack-dev/grenade