Remove LoadBalancer from Kafka cluster

[ramhiser]

Currently, a DNS name must be hardcoded in kafka-cluster.yaml. Currently, I'm getting the DNS name from kafka-service after its deployed via kubectl get service kafka-service.

By removing the load balancer, there's no concern of exposing to the outside world (unless that's warranted by use case) and there's no need to hardcode the DNS host.

[ramhiser]

• Removed LoadBalancer from kafka-cluster.yaml
• Test automatic kubernetes DNS name with kafkacat using a basic job
• Update README