Let's use the more compatible SSLv2/3 server method as default

This still won't work as it has no certificates so you'll still have
to override this method! But at least you can still just use this then
parent call to get a basic SSL_CTX on which you then just set some
certificates. Oh and yes I disable SSLv2 on purpose.

Signed-off-by: Toon Schoenmakers <nighteyes1993@gmail.com>