[quicwg/base-drafts] Server sends Handshake probe packet which does not attribute to any progress (#3582)

[Tatsuhiro Tsujikawa <[e-mail]>]

Suppose the following situation:

- Upon reception of client Initial, server sent Handshake(server_handshake#0) and Short(server_short#0) packets.
- server_short#0 was lost.
- client received server_handshake#0 and sent packet containing ClientFinished Handshake(client_handshake#0)
- client_handshake#0 was lost.
- server resent Handshake(server_handshake#1)
- client received server_handshake#1 and sent packet containing ACK only Handshake(client_handshake#1)
- server received client_handshake#1

At this point, server has still bytes_in_flight > 0 because it
has in-flight Short packet.  According to the current recovery
draft, OnLossDetectionTimeout instructs server to send Handshake
probe packet because handshake has not completed yet.  I'm not
sure what this packet is intended for. server has no in-flight
data for Handshake packet number space.  Client will send ACK for
it, but it does not progress any handshake state.


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