Ploy-ezjail

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* Dropped support for Python 3.6.
[fschulze]

* Added support for Python 3.10.
[fschulze]

* Add ``rc_before`` option.
[fschulze]

* Add support for jail specific settings.
[fschulze]

* Add ``ezjail-use-one-prefix`` option.
[fschulze]

* Renamed ``flavour`` option to ``ezjail-flavour``.
The old one still works, but will be deprecated in the future.
[fschulze]

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* Fix Python 3.x encoding errors when reporting errors from ezjail commands.
[fschulze]

* Use full instance name for logging in ``init_ssh_key`` for easier debugging
in case of multiple masters.
[fschulze]

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* Fix ZFS sections for Python 3.
[fschulze]

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

* Drop Python 3.4 support.
[fschulze]

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* Support for ploy 2.0.0.
[fschulze]

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* Fix startup script for FreeBSD 11.x by replacing dots in it's name with
underscores.
[fschulze]