Updates DevStack git repo link in Sahara Dev Ref
Updates DevStack git repo link in Sahara Dev Ref

This patch updates the git repo link for cloning
devstack in Sahara developer reference
Closes bug: #1527713

Change-Id: I351b34b0eb323e0ada00d406e9ab28b6c2257373

egafford/sahara,openstack/sahara,egafford/sahara,tellesnobrega/sahara,openstack/sahara,tellesnobrega/sahara