rdsamsa: add simple consumer
rdsamsa: add simple consumer

As with the parent commit, this works in the sense that you can pull
messages out of a topic, but it is still riddled with TODOs.  Most
notably, support for managing offsets is still missing (both automatic
and manual management).

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

yungchin/pykafka,vortec/pykafka,vortec/pykafka,benauthor/pykafka,fortime/pykafka,jofusa/pykafka,tempbottle/pykafka,wikimedia/operations-debs-python-pykafka,sontek/pykafka,aeroevan/pykafka,fortime/pykafka,sammerry/pykafka,thedrow/samsa,sammerry/pykafka,benauthor/pykafka,sontek/pykafka,thedrow/samsa,thedrow/samsa,yungchin/pykafka,appsoma/pykafka,jofusa/pykafka,appsoma/pykafka,benauthor/pykafka,wikimedia/operations-debs-python-pykafka,aeroevan/pykafka,wikimedia/operations-debs-python-pykafka,tempbottle/pykafka