Add more unit test for HDFS symlinks
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                 Key: HADOOP-5986
                 URL: https://issues.apache.org/jira/browse/HADOOP-5986
             Project: Hadoop Core
          Issue Type: Sub-task
          Components: dfs
            Reporter: dhruba borthakur


HADOOP-4044 introduces symbolic links in HDFS. That patch has some unit tests 
associated with it. The aim of this JIRA is to add more unit tests (including 
negative tests):

deleting a symlink that points to a file
deleting a symlink that points to a directory
symlink to a symlink
any test cases with relative links
delete linked to file, but not link, access link
delete linked to file, recreate the same file, access link
links to other filesystems
archives containing links
rename a file to an existing symlink
rename a symlink to an existing file
setTimes and setReplication cases should check the result on both the symlink 
and linked to file
tests involving lack of permissions to create symlinks
tests that try to createSymlinks with filesystems that don't support them
...


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