Update Confluent flavored tutorials Production section w/ a more thorough config for Confluent Cloud

[rspurgeon]

The current Confluent tutorials give a sparse configuration, like

bootstrap.servers=<FILL ME IN>

key.serializer=org.apache.kafka.common.serialization.StringSerializer
value.serializer=org.apache.kafka.common.serialization.StringSerializer
acks=all


#Properties below this line are specific to code in this application
input.topic.name=<FILL ME IN>
output.topic.name=<FILL ME IN>

But this is missing example values for a valid production deployment to confluent cloud. This issue tracks updating the Confluent tutorials to provide the reader a better "stub" configuration file that contains required Confluent Cloud values.