Changes to allow Kafka set-up to be able to use existing Hadoop Zookeeper quorum

By setting the new attribute ` use_hadoop_zookeeper_quorum ` true, Kafka cluster can use the existing Hadoop Zookeeper Quorum.
Though we need to override the `advertised_host_name` so that clients use the correct IP address, I do not see a large need for changing the `advertised_port`; I do see a need to change `node[:kafka][:port]` however. Would you mind setting that instead?