[quicwg/base-drafts] Fixed handshake key deadlock issue (#3093)

[martinduke <[e-mail]>]

Along with some other PRs, I believe this fixes #2863.

Fundamentally, there are four ways to solve the problem of one endpoint throwing away the handshake keys while the other has no 1-RTT data.

1) Keep the handshake keys forever
2) Make the endpoint start a 1-RTT PTO timer whether or not it has data to send
3) Require each endpoint to send a retransmittable frame soon after the handshake is complete; or
4) Make the endpoint wait until it receives an ack-eliciting 1-RTT packet, in addition to a 1-RTT ack.

I believe that the discard keys group might have a plurality for #4. The added condition makes sure that the peer's PTO machinery has started and will have little effect on most applications, including HTTP3.

This PR is a concrete statement of the fourth option.
You can view, comment on, or merge this pull request online at:

  https://github.com/quicwg/base-drafts/pull/3093

-- Commit Summary --

  * Fixed handshake key deadlock issue

-- File Changes --

    M draft-ietf-quic-tls.md (9)

-- Patch Links --

https://github.com/quicwg/base-drafts/pull/3093.patch
https://github.com/quicwg/base-drafts/pull/3093.diff

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