Make havana/devstack checkout our neutron branch

Change-Id: I72751e84215bcf5d441ddfd74b871c10a05ddd2d
Signed-off-by: Rosario Di Somma <rosario.disomma@dreamhost.com>
Merge pull request #14 from rodis/feature/add-dh-neutron-repo

Make havana/devstack checkout our neutron branch