prop224: Synchronize spec with implementation (August 2017)
During implementation and reviewing we noticed a few more deviations of the implementation from the spec, and also some spec errors.
Here is a list:
RENDEZVOUS2is not identical to
RENDEZVOUS1since rend points strips out the rend cookie.
We use a replaycache for the rendcookie when parsing intro2 on the service-side
No legacy INTRODUCE cell anymore since that was not needed.
We can have multiple intro onion keys with different types on the HS desc (see #22979 (moved))
We need to mention the ed25519 base point in the spec since we use it hardcoded in the code.
We might get more items here as client-side review moves forward.