ngtcp2: minor adjustments to make it work with public servers #6250
I tried to use HTTP/3 support against some public servers and ran into a similar issue as #6027, which was indeed a version mismatch. Given most of the public servers are still at draft-29, I suggest advertising the minimal QUIC version supported by ngtcp2. This PR also fixes an issue in path validation, where local address is clobbered when connecting via IPv6.
This field needs to be wide enough to hold sockaddr_in6 when connecting via IPv6. Otherwise, ngtcp2_conn_read_pkt will drop the packets because of the address mismatch: I00000022 [...] con ignore packet from unknown path We can safely assume that struct sockaddr_storage is available, as it is used in the public interface of ngtcp2.