ExecPlugin leaks a file descriptor
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                 Key: CHUKWA-229
                 URL: https://issues.apache.org/jira/browse/CHUKWA-229
             Project: Hadoop Chukwa
          Issue Type: Bug
          Components: data collection
            Reporter: Ari Rabkin
            Assignee: Ari Rabkin
         Attachments: fixExecFDLeak.patch

ExecPlugin never properly disposes of the subprocess's input fd. This means we 
run out of file descriptors eventually.  

This only affects ExecAdaptor; if ExecPlugin is invoked by the inputtools 
framework, the process doens't stay running.

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