Adapt to OpenSSL 1.1.1
    
    This is not a full support. It only makes the tests passing.
    Especially it does not document TLSv1.3 support and it does not
    support explicit session resumption in TLSv1.3.
    
    To pass the tests with openssl-1.1.1 it requires patched
    perl-Net-SSLeay >= 1.85-7.fc29. But it also works with older openssl
    regardless of perl-Net-SSLeay. Thus I did not add a dependency on an
    explicit perl-Net-SSLeay release.