Improve HADOOP_HOME detection and handling in hadoop-config
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                 Key: HADOOP-6604
                 URL: https://issues.apache.org/jira/browse/HADOOP-6604
             Project: Hadoop Common
          Issue Type: Improvement
    Affects Versions: 0.20.2
            Reporter: Chad Metcalf
            Assignee: Chad Metcalf
            Priority: Minor


If HADOOP_HOME is not set by the time hadoop-config is sourced we should try to 
guess it. Generally speaking hadoop-config.sh is in bin and HADOOP_HOME should 
generally be .. from there. Additionally we can do some verification of this 
guess by looking for jars in HADOOP_HOME.

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