Update FilterInitializer class to be more visible and take a conf for further 
development
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                 Key: HADOOP-6337
                 URL: https://issues.apache.org/jira/browse/HADOOP-6337
             Project: Hadoop Common
          Issue Type: New Feature
            Reporter: Jakob Homan
            Assignee: Jakob Homan
             Fix For: 0.22.0


Currently the FilterInitializer class, used to filter access to the Hadoop web 
interfaces, has its main method, initFilter, set to package private.  This 
means that any classes wishing to implement this type must be in the same 
package.  This should be public so FilterInitializers can reside in other 
packages.  

Also, currently all parameters to the FilterInitializer must be provided at 
compile time (or via a different configuration method).  It would be better if 
the FilterInitalizer::initFilter received a Configuration parameter so it can 
pull conf values out at run-time.  Alternatively, the class could implement 
Configured, but that seems heavier than is needed at this point.


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