HBASE-12641 Grant all permissions of hbase zookeeper node to hbase superuser in a secure cluster (Liu Shaohui)

Conflicts:
	hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZKUtil.java
	hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZooKeeperWatcher.java