Multi-host compatible etcd service watcher#86

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cloakedcode wants to merge 11 commits intoairbnb:masterfrom S2Games:master

+215-17

Commits on Aug 14, 2014

Integrated etcd service_watcher.
Alan Smith
committed
Switched EtcdWatcher to use the hosts parameter and rotate through the hosts until a reachable host is found.
Alan Smith
committed

Commits on Aug 15, 2014

Switched to less resilient failover for etcd in favor of fewer connections made to etcd.
Alan Smith
committed