rdkafka_example: Notify user of group.id need (issue #496)
rdkafka_example: Notify user of group.id need (issue #496)

janmejay/librdkafka,orthrus/librdkafka,orthrus/librdkafka,janmejay/librdkafka,klonikar/librdkafka,orthrus/librdkafka,klonikar/librdkafka,janmejay/librdkafka,senior7515/librdkafka,senior7515/librdkafka,orthrus/librdkafka,klonikar/librdkafka,senior7515/librdkafka,senior7515/librdkafka,klonikar/librdkafka,janmejay/librdkafka