Update ZK version to 3.4.10 (#414)

pom.xml

@@ -97,7 +97,7 @@ flexible messaging model and an intuitive client API.</description>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
     <bookkeeper.version>4.3.1.60-yahoo</bookkeeper.version>
-
+    <zookeeper.version>3.4.10</zookeeper.version>
     <netty.version>4.0.46.Final</netty.version>
     <storm.version>0.9.5</storm.version>
     <jetty.version>9.3.11.v20160721</jetty.version>
@@ -153,14 +153,14 @@ flexible messaging model and an intuitive client API.</description>
       <dependency>
         <groupId>org.apache.zookeeper</groupId>
         <artifactId>zookeeper</artifactId>
-        <version>3.4.8</version>
+        <version>${zookeeper.version}</version>
       </dependency>
 
       <dependency>
         <groupId>org.apache.zookeeper</groupId>
         <artifactId>zookeeper</artifactId>
         <classifier>tests</classifier>
-        <version>3.4.8</version>
+        <version>${zookeeper.version}</version>
       </dependency>
 
       <dependency>