[quicwg/base-drafts] Add Advice and Rules for CONN_CLOSE in Initial and Handshake (#1786)

[martinduke <[e-mail]>]

The presence of CONN_CLOSE in INITIAL and HANDSHAKE packets (and APP_CLOSE in HANDSHAKE) raises a number of questions for implementers.

If I must generate a CONN_CLOSE frame during the handshake, what context should I use? The highest one I have, or the highest that I received a packet for?

Relatedly, under what circumstances should I accept a CONN_CLOSE with old keys? I would argue we should toss any Initial Packet with CONN_CLOSE if the peer has already sent us something with Handshake keys, but it's possible to be more strict than that.

Should I accept a Handshake CONNECTION_CLOSE when we are using 1-RTT merely because I still have the Handshake keys lying around?

As far as I can tell, other frame types have no impact on the other contexts, except for a minor CRYPTO frame issue I'll handle in a different PR.

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