TestCommandLineJobSubmission assumes there is a /tmp dir that can be used for 
temp data
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                 Key: HADOOP-3704
                 URL: https://issues.apache.org/jira/browse/HADOOP-3704
             Project: Hadoop Core
          Issue Type: Bug
          Components: test
    Affects Versions: 0.19.0
            Reporter: Steve Loughran
            Priority: Minor



the test case in TestCommandLineJobSubmission assumes that it can create stuff 
in /tmp:

File buildDir = new File(System.getProperty("test.build.data", "/tmp"));

as well as being unix only, the result is a test case that doesnt work if >1 
person is running the test on the same cluster. it should really be driven off 
the java.io.tmpDir property

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