HIVE-8596: HiveServer2 dynamic service discovery: ZK throws too many connections error (Vaibhav Gumashta reviewed by Thejas Nair)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.14@1634409 13f79535-47bb-0310-9956-ffa450edef68