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/requirements.txt b/requirements.txt
index 37787b3..eab3c02 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -35,3 +35,7 @@
 # python-consul>=0.6.1  we need the pre-released version for now, because 0.6.1 does not
 # yet support Twisted. Once this is released, it will be the 0.6.2 version
 git+git://github.com/cablehead/python-consul.git
+
+# Twisted Python kafka client
+git+git://github.com/ciena/afkak.git
+