have the pre-commit checks run by hudson veto patches with System.out and 
System.err calls in them
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                 Key: HADOOP-7706
                 URL: https://issues.apache.org/jira/browse/HADOOP-7706
             Project: Hadoop Common
          Issue Type: Improvement
          Components: build
            Reporter: Steve Loughran
            Priority: Minor


I don't know how to do this, but we ought to get checkstyle to reject 
System.out and System.err calls, to stop them unintentionally getting into 
code. We may still need them in some places (LogLevel, external entry points), 
but those main() methods could all delegate to our own log output method that 
provides a single place where messages get printed

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