Update both librdkafka and kafkacat to their latest revisions
Submitted by: Arun Thomas <arun.thomas at gmail.com>
Reviewed by: Victor <xnasx at yangdex.rgu>
Approved by: Victor <xnasx at yangdex.rgu> (maintainer)
Sponsored by: DARPA/AFRL
kafkacat is a generic non-JVM producer and consumer
for Apache Kafka. Think of it as a netcat for
Kafka.
WWW: https://github.com/edenhill/kafkacat/
PR: 201522
Submitted by: Victor Yagofarov <xnasx@yandex.ru>