[quicwg/base-drafts] Remember Fewer Transport Parameters for 0-RTT (#2464)

[martinduke <[e-mail]>]

Sec 7.3.1 of quic-transport says: 
A client that attempts to send 0-RTT data MUST remember the transport parameters used by the server. The transport parameters that the server advertises during connection establishment apply to all connections that are resumed using the keying material established during that handshake. Remembered transport parameters apply to the new connection until the handshake completes and new transport parameters from the server can be provided.

Later on, the section makes it clear that this is really about the flow control parameters, which makes a lot of sense, but here I am storing all this data to be compliant.

I propose that we change the MUST above to refer to only the 6 FC parameters. This reduces the stuff that clients have to store.

going through each:
original_connection_id: clearly useless
idle_timeout: useless in handshake
stateless_reset_token: clearly useless
max_packet_size: could be useful, but meh
ack_delay_exponent: not useful before we get the server Handshake
max_ack_delay: same
disable_migration: same
preferred_address: same

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