HIVE-6647 : Bump the thrift api version to V7 for HiveServer2 (Prasad Mujumdar via Thejas Nair)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.13@1577718 13f79535-47bb-0310-9956-ffa450edef68