Parallel-ssh

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Changes
--------

* All clients now support private key data as bytes in ``pkey`` parameter for authentication from in-memory private key
data - 317. See `documentation <https://parallel-ssh.readthedocs.io/en/latest/advanced.html#in-memory-private-keys>`_
for examples.
* Parallel clients now read a provided private key path only once and use in-memory data for authentication to avoid
reading same file multiple times, if a path is provided.

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Fixes
------

* ``copy_file`` performance would be abnormally low when copying plain text files - 100x performance increase. Binary
file copying performance has also increased.

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Changes
-------

* All clients now support IPv6 addresses for both DNS and IP entries in host list.
* Added ``ipv6_only`` flag to ``ParallelSSHClient`` and ``SSHClient`` for choosing only IPv6 addresses when both v4 and
v6 are available.
* Removed Python 2 from binary wheel compatibility as it is no longer supported and not guaranteed to work.
* Host name is now an argument for all exceptions raised by single clients.

Fixes
-----

* ``HostOutput`` would have empty host on some exceptions when ``stop_on_errors`` is ``False`` - 297
* Race condition when forcefully closing channel via ``SSHClient.close_channel`` while channel data was left unread.

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Changes
-------

* ``user`` keyword argument no longer required on Windows - exception is raised if user cannot be identified.
* Removed deprecated since ``2.0.0`` functions and parameters.

Fixes
-----

* ``copy_remote_file`` with recurse enabled would not use a provided encoding for sub-directories - 284
* Reconnecting to the same proxy host when proxy is configured would sometimes cause segfauls - 304

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Fixes
------

* Password authentication via ``pssh.clients.ssh`` would not work - 276

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Fixes
-----

* Sending files via ``scp_send`` or ``sftp_put`` with timeout set could timeout unexpectedly on opening remote file - 271.