The old enumeration didn't allow discriminating the key exchange
algorithms used, but only allowed the handshake with the server. With
this new enumeration, we can know which key exchange algorithm we are
actually supposed to use :^)
Also sort the existing cipher suites, and remove the unsupported ones.
We don't support any of these recommended ciphers, but at least we now
know which ones we should focus on :^)
Instead of sprinkling the definition of the ciper suites all over the
TLS implementation, let's regroup it all once and for all in a single
place, and then add our new implementations there.
