IMPALA-1130: Multi-line query with unicode input throws UnicodeEncodeError

Change-Id: If9e8696ddb0287525573deade61a3de85a9a1081
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/3771
Reviewed-by: Abdullah Yousufi <abdullah.yousufi@cloudera.com>
Tested-by: jenkins