Fix alias order so that /w/images isn't overridden

Change-Id: Iccadd43221ed621a93beadf358159f94e3848941
Reviewed-on: https://review.openstack.org/20268
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins