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Ava Chow 3c63c2f324 Merge bitcoin/bitcoin#29347 : net: enable v2transport by default

0bef1042ce net: enable v2transport by default (Pieter Wuille)

Pull request description:

  This enables BIP324's v2 transport by default (see #27634):
  * Inbound connections will auto-sense whether v1 or v2 is in use.
  * Automatic outbound connections will use v2 if `NODE_P2P_V2` was set in addr gossip, but retry with v1 if met with immediate failure.
  * Manual outbound connections will default to v2, but retry with v1 if met with immediate failure.

  It remains possible to run with `-v2transport=0` to disable all of these, and make all outbound and inbound connections v1. It also remains possible to specify the `v2transport` argument to the `addnode` RPC as `false`, to disable attempting a v2 connection for that particular added node.

ACKs for top commit:
  stratospher:
    ACK 0bef104.
  josibake:
    reACK 0bef1042ce
  achow101:
    ACK 0bef1042ce
  naumenkogs:
    ACK 0bef1042ce
  theStack:
    ACK 0bef1042ce
  willcl-ark:
    crACK 0bef1042ce
  BrandonOdiwuor:
    utACK 0bef1042ce
  pablomartin4btc:
    re ACK 0bef1042ce
  kristapsk:
    utACK 0bef1042ce

Tree-SHA512: 3f17a91e318b9304c40c74a7a5b231149f664ae684d13e9739a05be6c05ba9720f3c3c62da6a73ace0ae8ce733f1c8410b211f9fa15694e6a8d28999ab9882d8