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* Allow broker's service clusterIP customisation This customisation is useful to configure headless vs non-headless broker's service. The default is headless broker service, i.e. a service for which kubernetes does not allocate an IP address (https://kubernetes.io/docs/concepts/services-networking/service/#type-clusterip). A headless service is a very simple type of service that doesn't seem to work well when pulsar service is exposed by pulsar-proxy via a nodeport. Addresses #497. * Address review comments https://github.com/apache/pulsar-helm-chart/pull/498/files#r1605762934 and https://github.com/apache/pulsar-helm-chart/pull/498/files#r1605763245 * Move doc to Values.broker.service