HIVE-5163 : refactor org.apache.hadoop.mapred.HCatMapRedUtil (Eugene Koifman via Thejas Nair)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1519530 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5163 : refactor org.apache.hadoop.mapred.HCatMapRedUtil - HIVE-5163.update.2 

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1519538 13f79535-47bb-0310-9956-ffa450edef68