* Replace Reports(round) by Reports(silent) to avoid a lock around all

  queue operations, which causes an automatic deadlock on
  a: get
  a: ... lock _queue_lock
  a: ... block on _queue
                          b: put
                          b: ... block on _queue_lock
  Because nobody reads from the main queue that used round = True, this
  doesn't change application behavior.
* Drop return value of Reports.put, it is always None anyway.
* Fix self._mailboxes locking: instead of
      try:
          lock
          ...
      finally:
          unlock
  it needs to be
      lock
      try:
          ...
      finally:
          unlock

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