update Zookeeper version to 3.4.9

Issue-ID: DMAAP-1007
Change-Id: Ic6100f65cac275fc200ec91a509a6a7dfcb4f0dd
Signed-off-by: sunil unnava <sunil.unnava@att.com>
diff --git a/src/main/docker/Dockerfile b/src/main/docker/Dockerfile
index 497bf7d..886416b 100644
--- a/src/main/docker/Dockerfile
+++ b/src/main/docker/Dockerfile
@@ -6,7 +6,7 @@
     JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
 
 
-ARG ZK_DIST=zookeeper-3.4.10
+ARG ZK_DIST=zookeeper-3.4.9
 
 RUN set -x \
     && apt-get update \