add logging about rdkafka import
add logging about rdkafka import

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

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