HIVE-6697 : HiveServer2 secure thrift/http authentication needs to support SPNego  (Dilli Arumugam via Thejas Nair)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.13@1582850 13f79535-47bb-0310-9956-ffa450edef68