Make some "flag" booleans volatile because they are set/read in different 
threads
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                 Key: HADOOP-4671
                 URL: https://issues.apache.org/jira/browse/HADOOP-4671
             Project: Hadoop Core
          Issue Type: Bug
          Components: dfs
            Reporter: Owen O'Malley
             Fix For: 0.20.0


Peter Veentjer  has identified the following variables as being tracked in a 
loop without assignments or synchronization.

AgentControllerSocketListener.closing
HttpConnector.stopMe
IndexUpdateReducer.closed
SecundaryNodeName.shouldRun
voTask.hasNext


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