Add missing License Header

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1606446 13f79535-47bb-0310-9956-ffa450edef68
PIG-4043: JobClient.getMap/ReduceTaskReports() causes OOM for jobs with a large number of tasks (cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1606619 13f79535-47bb-0310-9956-ffa450edef68