Support a stop command in ShellCommandExecutor 
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                 Key: HADOOP-7722
                 URL: https://issues.apache.org/jira/browse/HADOOP-7722
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 0.23.0
            Reporter: Hitesh Shah
            Priority: Minor
             Fix For: 0.23.0


Add a stop function call to Shell so as to either stop the process from getting 
started if not already done so or destroy the process if it already has 
started. 

Context of usage: 
There can be race conditions when trying to kill an execution as the 
shell::execute call is blocking and using the getProcess call is not a  
feasible option as there can be a delay between the execute call and when the 
process object is actually created ( after which it can be used to kill the 
running sub-process ). 




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