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Automatic merge from submit-queue etcd3/store: watcher implementation ref: https://github.com/kubernetes/kubernetes/issues/22448 This PR does: - Provide a watcher that uses etcd v3 API to watch changes via etcd and process them based on existing logic of storage.Interface.Watch(), WatchList(). - By using the watcher, very trivial to implement Watch() and WatchList() in etcd3 storage.Interface implementation.