[Async-sig] bioopenssl: ssl protocol for asyncio but using pyOpenSSL

This is my first asyncio project. I will probably not finish it, but let me know if anyone's interested in picking up where I left off. It is `asyncio.sslproto`, but with all calls to `ssl` replaced with equivalent calls to pyOpenSSL's `OpenSSL.SSL` module. It passes some of the tests, I think it i

[Async-sig] Re: bioopenssl: ssl protocol for asyncio but using pyOpenSSL

Specifically I was interested in OCSP stapling. One might also be interested in certain other callbacks like the one needed to serve SNI on Python < 3.7. It's possible to load certs from memory instead of from the filesystem in pyOpenSSL. The most important missing piece is hostname verification; p