Change the default HADOOP_PID_DIR to $HADOOP_HOME/pids
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                 Key: HADOOP-6606
                 URL: https://issues.apache.org/jira/browse/HADOOP-6606
             Project: Hadoop Common
          Issue Type: Improvement
    Affects Versions: 0.20.2
            Reporter: Chad Metcalf
            Assignee: Chad Metcalf


/tmp should not be used as a pid directory. There is too high a likelihood that 
pid files could be altered or deleted. A more reasonable default is 
$HADOOP_HOME/pids. 

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