add broker rack to docker image #2
Description
The template needs the rack info.
set racks to AZ for Kafka set up.
Need to set broker.rack via KAFKA_BROKER_RACK.
The broker.rack should match the AZ for AWS.
The Kafka Docker image needs to be modified to pass the broker.id via KAFKA_BROKER_RACK.
This is needed now that we have more nodes. Kafka needs to know which racks (AZs) are closer.
The terraform script will need to be modified to pass Rack information to the new Docker container.