New entity for Apache Kafka messaging
Added test using Kafka API and example application
Wait for JMX availability before setting SERVICE_UP
Organize imports
Update test using Kafka API
Fix port check and sensor name and use RMI agent for JMX in zookeeper
Move common driver code to shared parent class
Increase startup delay
Tidy up interface definitions
Changes based on review comments, including updating to use latest 0.5.0 APIs