extend JobClient.runJob(JobConf) with the ability to take a timeout, so fail 
better during test runs
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                 Key: HADOOP-4639
                 URL: https://issues.apache.org/jira/browse/HADOOP-4639
             Project: Hadoop Core
          Issue Type: Improvement
          Components: test
    Affects Versions: 0.20.0
            Reporter: Steve Loughran
            Priority: Minor


Tests that submit jobs via JobClient hang until they are killed if something 
goes wrong in the back end -JobClient does not impose limits on how long runs 
should take, but JUnit does. If we had an overload of runJob() that took a 
timeout, JobClient could kill a job that was taking too long, extracting the 
stack trace and better diagnostics to the test reports. 

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