Ploy-ec2

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* Drop support for Python < 3.7.
[fschulze]

* Add support for Python up to 3.10.
[fschulze]

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* Support for ploy 2.0.0.
[fschulze]

* Support yet another ssh key output format from console output of instance.
[fschulze]

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* Check status of volume to give helpful error message if it's still attached.
[fschulze]

* Allow volume definition via ``ec2-volume`` sections.
[fschulze]

* Fix support of console output for the ``ploy debug -c`` command.
[fschulze]

* Reuse init_ssh_key from ploy.plain to get way more options and error checking.
[fschulze]

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* Only set device_map if it's in the config, the previous ``None`` default
didn't always work.
[fschulze]

* Fixed console output availability test for the status command.
[fschulze]

* Better error message if fingerprint isn't in console output.
[fschulze]

* There can be multiple instances for the same name if they were quickly started
and stopped. Handle that case when requesting status of master.
[fschulze]

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* Print status of all ec2 instances when requesting status of master.
[fschulze]

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* Added documentation.
[fschulze]