'dfsadmin -safemode enter' should prevent the namenode from leaving safemode 
automatically after startup
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                 Key: HADOOP-1980
                 URL: https://issues.apache.org/jira/browse/HADOOP-1980
             Project: Hadoop
          Issue Type: Bug
          Components: dfs
            Reporter: Koji Noguchi
            Priority: Minor


When debugging, I'd like to be able to intentionally keep the FS in a safemode. 
(For example, when looking at HADOOP-1978).
Also, it'll be nice if the namenode can still update the webUI/report when it 
hits the dfs.safemode.threshold.pct.

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