Misc improvements to TestFileAppend2
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                 Key: HDFS-1244
                 URL: https://issues.apache.org/jira/browse/HDFS-1244
             Project: Hadoop HDFS
          Issue Type: Test
          Components: test
    Affects Versions: 0.20-append, 0.22.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
            Priority: Minor
             Fix For: 0.20-append, 0.22.0
         Attachments: hdfs-1244-0.20-append.txt

I've made a bunch of improvements to TestFileAppend2:
 - Now has a main() with various command line options to change the workload 
(number of DNs, number of threads, etc)
 - Sleeps for less time in between operations to catch races around close/reopen
 - Updates to Junit 4 style, adds timeouts
 - Improves error mesages on failure

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