This commit consists of:
1) Provide a kafka client to publish events to kafka brokers
2) Provide zookeeper and kafka docker containers for local testing,
   will not be present in production
3) Sends a regular heartbeat to the kafka broker from voltha to
   exercise all the components
4) Provides a basic kafka consumeri (requires kafka-python to be
   installed)  to read the messages off the local kafka broker -
   this time it is only heartbeat messages
diff --git a/kafka/start-kafka-shell.sh b/kafka/start-kafka-shell.sh
new file mode 100755
index 0000000..62663e4
--- /dev/null
+++ b/kafka/start-kafka-shell.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+docker run --rm -v /var/run/docker.sock:/var/run/docker.sock -e HOST_IP=$1 -e ZK=$2 -i -t wurstmeister/kafka /bin/bash