[issue8477] _ssl: support surrogates in filenames, and bytes/bytearray filenames

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> key_file and cert_file are mandatory

No, they are not. Not for a client connection, at least.
Also, please add at least a simple test.

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<http://bugs.python.org/issue8477>
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