Printing all output as raw bytes allows MaxScale to control the formatting
process. This also removes the need to convert the bytes to Python strings
and the need to parse the JSON.
As the cdc_kafka_producer script is an example, it should flush the
producer after every new record. This should make it easier to see that
events from MaxScale are sent to Kafka.
There's no need to process the JSON twice as the Kafka producer is
expected to be used with the Python CDC client which already splits the
JSON with newlines.
