Better handling of OffsetFetch failures
Better handling of OffsetFetch failures

Previously an OffsetFetch failure (due to e.g. lacking group coordinator)
would cause an offset reset followed by consumption, this lead to receiving
the wrong messages.

janmejay/librdkafka,senior7515/librdkafka,senior7515/librdkafka,janmejay/librdkafka,janmejay/librdkafka,senior7515/librdkafka,orthrus/librdkafka,orthrus/librdkafka,orthrus/librdkafka,orthrus/librdkafka,senior7515/librdkafka,janmejay/librdkafka