Fixed hadoop related deprecation warnings.

http://grepcode.com/file/repository.cloudera.com/content/repositories/releases/com.cloudera.hadoop/hadoop-core/0.20.2-737/org/apache/hadoop/mapred/OutputCommitter.java#OutputCommitter.cleanupJob%28org.apache.hadoop.mapred.JobContext%29

Hadoop 20.2 onwards commitJob internally calls cleanJob