Fix bug 1167099, make basic-install know branch it's building.

Change-Id: Ib24b6ba2a78530adeffee6a1bd69962b40192bd5
Reviewed-on: https://review.openstack.org/26568
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins