Address review comments of the kafka nbi

Change-Id: I4bffdd92bb05d3f4d4b1b077f2ccf0f332204ed2
diff --git a/Makefile b/Makefile
index 5520aa7..45dea97 100644
--- a/Makefile
+++ b/Makefile
@@ -101,6 +101,8 @@
 	docker pull fluent/fluentd:latest
 	docker pull gliderlabs/registrator:latest
 	docker pull ubuntu:xenial
+	docker pull wurstmeister/kafka
+	docker pull wurstmeister/zookeeper
 
 purge-venv:
 	rm -fr ${VENVDIR}