Add symlink support to FileSystem
---------------------------------

                 Key: HADOOP-8040
                 URL: https://issues.apache.org/jira/browse/HADOOP-8040
             Project: Hadoop Common
          Issue Type: New Feature
          Components: fs
    Affects Versions: 0.23.0
            Reporter: Eli Collins
            Assignee: Eli Collins


HADOOP-6421 added symbolic links to FileContext. Resolving symlinks is done on 
the client-side, and therefore requires client support. An HDFS symlink 
(created by FileContext) when accessed by FileSystem will result in an 
unhandled UnresolvedLinkException. Because not all users will migrate from 
FileSystem to FileContext in lock step, and we want users of FileSystem to be 
able to access all paths created by FileContext, we need to support symlink 
resolution in FileSystem as well, to facilitate migration to FileContext.

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