[quic] How nginx-quic migrate quic connection when reload/restart

[Gao,Yan(ACG VCP)]

Hi, all
       Quic connection can be migrated by the ID. And nginx-quic load balancing by reuseport, which using a hash based on 4-tuple of the connection.
How to migrate quic connection when reload/restart?
We can change reuseport behavior by bpf which using a hash based on the quic ID, but it seems useless, because listen processes/pids doubles when nginx reload/restart, and hash result would change
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