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* Update docs/submodules/yardstick from branch 'master'
  - cancel all queue join threads
    
    In some cases we are blocking in base.Runner join() because the
    queues are not empty
    
    call cancel_join_thread to prevent the Queue from blocking the
    Process exit
    
    https://docs.python.org/3.3/library/multiprocessing.html#all-platforms
    
    Joining processes that use queues
    
      Bear in mind that a process that has put items in a queue will wait
      before terminating until all the buffered items are fed by the
      "feeder" thread to the underlying pipe. (The child process can call
      the cancel_join_thread() method of the queue to avoid this behaviour.)
    
      This means that whenever you use a queue you need to make sure that
      all items which have been put on the queue will eventually be removed
      before the process is joined. Otherwise you cannot be sure that
      processes which have put items on the queue will terminate. Remember
      also that non-daemonic processes will be joined automatically.
    
    Warning
    
      As mentioned above, if a child process has put items on a queue (and
      it has not used JoinableQueue.cancel_join_thread), then that process
      will not terminate until all buffered items have been flushed to the
      pipe.
    
      This means that if you try joining that process you may get a deadlock
      unless you are sure that all items which have been put on the queue
      have been consumed. Similarly, if the child process is non-daemonic
      then the parent process may hang on exit when it tries to join all its
      non-daemonic children.
    
    cancel_join_thread()
    
      Prevent join_thread() from blocking. In particular, this prevents the
      background thread from being joined automatically when the process
      exits – see join_thread().
    
      A better name for this method might be allow_exit_without_flush(). It
      is likely to cause enqueued data to lost, and you almost certainly
      will not need to use it. It is really only there if you need the
      current process to exit immediately without waiting to flush enqueued
      data to the underlying pipe, and you don’t care about lost data.
    
    Change-Id: I345c722a752bddf9f0824a11cdf52ae9f04669af
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
    

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