Ploy

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* Fix ssh timeout handling.
[witsch, fschulze]

* Fix getargspec deprecation warning with Python 3.x.
[kappeck, fschulze]

------------------

* Dropped support for Python 3.6.
[fschulze]

* Added support for Python 3.10.
[fschulze]

--------------------

* Make a proper copy of the configuration for instances with multiple masters.
[fschulze]

* Use ``format_exc`` for error reporting in ``ssh`` command for more details.
[fschulze]

--------------------

* Fix multiple master association for ``[instance:...]`` sections.
[fschulze]

--------------------

* Some Python 3.x encoding related fixes.
[fschulze]

--------------------

* Add 5 seconds default timeout to ssh connections.
[fschulze]

* Dropped support for Python 3.4.
[fschulze]