HIVE-6154 : HiveServer2 returns a detailed error message to the client only when the underlying exception is a HiveSQLException (Vaibhav Gumashta via Thejas Nair)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1556648 13f79535-47bb-0310-9956-ffa450edef68