enforce TLS<1.3 for SSL renegotiation tests#249
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In new versions of PyOpenSSL, it seems insufficient to use
openssl_ssl.Context(openssl_ssl.SSLv23_METHOD)to have TLS < 1.3. As theOP_NO_TLSv1_3may not always exist in PyOpenSSL, we just use the one from CPython on the client side.