HIVE-7947 : Add message at the end of each testcase with timestamp in Webhcat system tests (Jagruti Varia, reviewed by Deepesh Khandelwal, Eugene Koifman, Thejas Nair)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1622393 13f79535-47bb-0310-9956-ffa450edef68