rdkafka: mini-fix to parent commit
rdkafka: mini-fix to parent commit

`self._rd_kafka_consumer` slipped in there from an uncommitted earlier
version of parent...

Signed-off-by: Yung-Chin Oei <e4c1ab9da74060df152545062ee274845648ed6c@yungchin.nl>

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