Add missing Apache license header in some files in MR and also add the rat
plugin to the poms.
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Key: MAPREDUCE-2877
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2877
Project: Hadoop Map/Reduce
Issue Type: Bug
Reporter: Mahadev konar
Assignee: Mahadev konar
Fix For: 0.23.0
Some of the files in MR have a missing Apache header files. We also need to add
the apache-rat plugin to be able to run rat automatically via the top level
pom.
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