Refactor Network partitioning test

- Changed Iptables rules to allow for external atomix cluster
- Add ip6table rules as well
- Add ip6table rule cleanup to cleanup script

Change-Id: Ie15c13ab5cca3937137f6a6bdaa7f407821f1576
diff --git a/TestON/bin/cleanup.sh b/TestON/bin/cleanup.sh
index b6a937b..23b288a 100755
--- a/TestON/bin/cleanup.sh
+++ b/TestON/bin/cleanup.sh
@@ -54,5 +54,8 @@
         echo "Restoring iptables rules on ${i}"
         ssh sdn@$i "sudo iptables -F"
         ssh sdn@$i "sudo iptables-restore < /etc/iptables/rules.v4"
+        echo "Restoring ip6tables rules on ${i}"
+        ssh sdn@$i "sudo ip6tables -F"
+        ssh sdn@$i "sudo ip6tables-restore < /etc/iptables/rules.v6"
     done
 fi