prop198: Detect the list of ciphersuites we used to lie about having

prop198: Detect the list of ciphersuites we used to lie about having

This is less easy than you might think; we can't just look at the
client ciphers list, since openssl doesn't remember client ciphers if
it doesn't know about them.  So we have to keep a list of the "v2"
ciphers, with the ones we don't know about removed.