Make StatusHttpServer (usefully) subclassable
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                 Key: HADOOP-2024
                 URL: https://issues.apache.org/jira/browse/HADOOP-2024
             Project: Hadoop
          Issue Type: Improvement
          Components: mapred
            Reporter: stack
            Priority: Minor


hbase puts up webapps modelled on those deployed by dfs and mapreduce.  
Currently it does this by copying the bulk of StatusHttpServer down to hbase 
util as a new class named InfoServer.  StatusHttpServer is copied rather than 
subclassed because I need access to the currently-private resource loading.

As is, understandably, all webapp-related resources are presumed under the 
first 'webapps' directory found.  It doesn't allow for the new condition where 
some resources can be found in hadoop and then others in hbase.

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