HIVE-8172: HiveServer2 dynamic service discovery should let the JDBC client use default ZooKeeper namespace. (Vaibhav Gumashta reviewed by Thejas Nair)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1629951 13f79535-47bb-0310-9956-ffa450edef68