add compacted_topic to rdkafkacomsumer
add compacted_topic to rdkafkacomsumer

wikimedia/operations-debs-python-pykafka,benauthor/pykafka,wikimedia/operations-debs-python-pykafka,wikimedia/operations-debs-python-pykafka,benauthor/pykafka,benauthor/pykafka