[$75] Update apps to use the no-kafka group consumer

[jmgasper]

Topcoder has requested that we move from the kafka SimpleConsumer

this.consumer = new kafka.SimpleConsumer(config.KAFKA_OPTIONS);

To a group consumer, similar to what's seen here:

https://github.com/topcoder-platform/submission-processor/blob/68c1efabe9adb9e67c3a8c425c78a7ae1c030c0f/src/app.js#L14

We should ensure that we add the KAFKA_GROUP_ID to the configuration, document it in the configuration.md and make sure that the receiver and processor both work as expected with the change.

[jmgasper]

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[jmgasper]

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[jmgasper]

Contest https://www.topcoder-dev.com/challenges/30105972 has been created for this ticket.

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[jmgasper]

Contest https://www.topcoder-dev.com/challenges/30105973 has been created for this ticket.

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[jmgasper]

Contest https://www.topcoder.com/challenges/30105974 has been created for this ticket.

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[jmgasper]

Contest https://www.topcoder.com/challenges/30105974 has been updated - the new changes has been updated for this ticket.

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