title: remove dead jobs from nomad status
body: <p>I was running a cron (periodic) job through nomad which ran every 30 sec, the job does nothing but just </p>
  
  <p><code>echo "some string"</code> </p>
  
  <p>and hence ends immediately</p>
  
  <p>when I do </p>
  
  <p><code>nomad status</code></p>
  
  <p>I get all the dead jobs also-- the jobs that have finished executing, which are useless to me. Is there some way to remove the dead jobs?</p>
  
  <p>PS: one obvious solution is to grep out the dead jobs, any solution provided by nomad?</p>