HIVE-6512 : HiveServer2 ThriftCLIServiceTest#testDoAs is an invalid test (Vaibhav Gumashta via Thejas Nair)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.13@1576699 13f79535-47bb-0310-9956-ffa450edef68