ssl: Backport cert_auth exclusion option to pre TLS-1.3 #9001
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Backport certificate_authorities option to pre TLS-1.3 servers so that also they can choose to not send certificate authorities information in their certificate request.
This can be needed if pre-TLS-1.3 clients choose to be more strict about adhering to this information as required by TLS-1.3, when the TLS-1.3 extension, is used. So this gives the server the possibility to not send this information in case it has way to handle and verify client certificate chains that can not be determined to match this information at the client side.