[5453] replace datetime.now with datetime.utcnow
[5453] replace datetime.now with datetime.utcnow

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