Expose zookeeper and kafka ports so they are accessible outside docker

1. zookeeper must be exposed for kafka 'shell' scripts using --zookeeper (eg. kafka-topics.sh)
2. kafka must be on the original port (and hostname) for 'shell' script using --bootstrap-server (eg. kafka-console-consumer.sh), or it will loop forever with this error message: Connection to node 1002 (kafka/127.0.0.1:9092) could not be established. Broker may not be available.