Assert type constraints in the FileStatus constructor
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                 Key: HADOOP-7032
                 URL: https://issues.apache.org/jira/browse/HADOOP-7032
             Project: Hadoop Common
          Issue Type: Improvement
          Components: fs
            Reporter: Eli Collins
            Assignee: Eli Collins
             Fix For: 0.22.0


A FileStatus may represent a file, directory or symlink.  This is indicated 
using the isdir and symlink members, let's add an assert that validates the 
contstraints on these members (eg a directory may not have the symlink member 
set).  We could also verify this by having more than one constructor but we 
don't statically know the type of the file status when we create it.

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