py-supervisor: updated to 4.2.2

4.2.2 (2021-02-26)
------------------

- Fixed a bug where ``supervisord`` could crash if a subprocess exited
  immediately before trying to kill it.

- Fixed a bug where the ``stdout_syslog`` and ``stderr_syslog`` options
  of a ``[program:x]`` section could not be used unless file logging for
  the same program had also been configured.  The file and syslog options
  can now be used independently.  Patch by Scott Stroupe.

- Fixed a bug where the ``logfile`` option in the ``[supervisord]``
  section would not log to syslog when the special filename of
  ``syslog`` was supplied, as is supported by all other log filename
  options.  Patch by Franck Cuny.

- Fixed a bug where environment variables defined in ``environment=``
  in the ``[supervisord]`` section or a ``[program:x]`` section could
  not be used in ``%(ENV_x)s`` expansions.  Patch by MythRen.

- The  ``supervisorctl signal`` command now allows a signal to be sent
  when a process is in the ``STOPPING`` state.  Patch by Mike Gould.

- ``supervisorctl`` and ``supervisord`` now print help when given ``-?``
  in addition to the existing ``-h``/``--help``.

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