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During accept, a quic-conn is rebind to a new thread. This process is done in two times : * first on the original thread via qc_set_tid_affinity() * then on the newly assigned thread via qc_finalize_affinity_rebind() Most quic_conn operations (I/O tasklet, task and quic_conn FD socket read) are reactivated ony after the second step. However, there is a possibility that datagrams are handled before it via quic_dgram_parse() when using listener sockets. This does not seem to cause any issue but this may cause unexpected behavior in the future. To simplify this, qc_finalize_affinity_rebind() will be called both by qc_xprt_start() and quic_dgram_parse(). Only one invocation will be performed thanks to the new flag QUIC_FL_CONN_AFFINITY_CHANGED. This should be backported up to 2.7.