Fixing ConsistentHash hashing, lib versions and logging 

Hello!
I was able to successfully run graphite-relay on my testing Graphite environment with  ~500K metrics/min with my changes below. Main change is Graphite-compatible hashing which provide good performance, since carbonlink requests from graphite-web hits proper carbon-caches now. Also I upgraded scopt and netty and make slight logging changes (we got many garbage from some agents, but maybe it's not an option for others)