title: Is it possible to shutdown a dask.distributed cluster given a Client instance?
body: <p>if I have a <code>distributed.Client</code> instance can I use that to shutdown the remote cluster? i.e. to kill all workers and also shutdown the scheduler?</p>
  
  <p>If that can't be done using the <code>Client</code> instance is there another way other than manually killing each remote process?</p>