Update ZooKeeper to 3.4.6

- Updated ZooKeeper to current stable version. (ONOS-1347)
- There are some references in scripts under old-scripts,
  which has not been updated.

Change-Id: Iac96c46ee7e821bcc0e471a5c8cd8a3165a4b439
diff --git a/sample/ONS2014demo/scripts/check-cluster-hw.sh b/sample/ONS2014demo/scripts/check-cluster-hw.sh
index 1243e3a..e7dc031 100755
--- a/sample/ONS2014demo/scripts/check-cluster-hw.sh
+++ b/sample/ONS2014demo/scripts/check-cluster-hw.sh
@@ -21,7 +21,7 @@
 echo    "****************************"
 echo 	"***** ZOOKEEPER STATUS *****"
 echo    "****************************"
-dsh -g onos '~/zookeeper-3.4.5/bin/zkServer.sh status'
+dsh -g onos '~/zookeeper-3.4.6/bin/zkServer.sh status'
 
 echo 	""
 echo    "**************************"