[#5973] preserve deterministic order in diff lists, so tests always pass
[#5973] preserve deterministic order in diff lists, so tests always pass

apache/allura,apache/allura,heiths/allura,apache/allura,apache/allura,lym/allura-git,lym/allura-git,lym/allura-git,apache/incubator-allura,apache/incubator-allura,apache/incubator-allura,heiths/allura,apache/allura,lym/allura-git,heiths/allura,heiths/allura,heiths/allura,lym/allura-git,apache/incubator-allura