added KafkaV2 sink using new kafka producer in 0.8.2-SNAPSHOT

@metacret here is the pull request that we discussed.  Please see suro-server/conf/sink_using_kafkaV2.json for the configuration syntax.
This might need to be checked carefully. Old producer is publishing its various metrics through yammer-metric library but I didn't check how new producer is publishing its metrics and which metrics are there.