Upgrade ZooKeeper to 3.4.3

Summary:
Upgrade ZooKeeper to 3.4.3 for bug fixes and compatibility with
BookKeeper.  This revision updates the ZooKeeper charge and modifies
MiniAvatarCluster to use new classnames for started the embedded
ZooKeeper server.

Test Plan:
Compile and run all unit tests for high-availability module Verify
that we can connect to and communicate with existing ZooKeeper
clusters that may use an older version of ZooKeeper.

Revert Plan:

Reviewers: hkuang, tomasz

src/contrib/highavailability/src/test/org/apache/hadoop/hdfs/MiniAvatarCluster.java

@@ -29,10 +29,10 @@
 
 import junit.framework.Assert;
 
+import org.apache.zookeeper.server.NIOServerCnxnFactory;
 import org.apache.zookeeper.server.ZooKeeperServer;
 import org.apache.zookeeper.server.quorum.QuorumPeerConfig.ConfigException;
 import org.apache.zookeeper.server.persistence.FileTxnSnapLog;
-import org.apache.zookeeper.server.NIOServerCnxn;
 import org.apache.zookeeper.server.ServerConfig;
 
 import org.apache.commons.logging.Log;
@@ -310,7 +310,7 @@ public void cleanupAvatarDirs() throws IOException {
   }
 
   private static ZooKeeperServer zooKeeper;
-  private static NIOServerCnxn.Factory cnxnFactory;
+  private static NIOServerCnxnFactory cnxnFactory;
 
   private ArrayList<DataNodeProperties> dataNodes = 
     new ArrayList<DataNodeProperties>();
@@ -524,9 +524,9 @@ public static void createAndStartZooKeeper()
     zooKeeper.setMinSessionTimeout(zkConf.getMinSessionTimeout());
     zooKeeper.setMaxSessionTimeout(zkConf.getMaxSessionTimeout());
 
-    cnxnFactory =
-      new NIOServerCnxn.Factory(zkConf.getClientPortAddress(),
-                                zkConf.getMaxClientCnxns());
+    cnxnFactory = new NIOServerCnxnFactory();
+    cnxnFactory.configure(zkConf.getClientPortAddress(),
+        zkConf.getMaxClientCnxns());
     cnxnFactory.startup(zooKeeper);
 
   }