If we don't specify the current set of partitions to the commit call the Kafka
consumer object seems to issue a commit for all the partitions it has
information on and not just the ones it is actively reading. This fix will
allow it to only commit to the partitions that it is consuming from.
Change-Id: Ifd5aa9c8fe4d83f804629f1a301a40556721d018
633ab3ec6a