Merge bitcoin/bitcoin#29511: test: Fix intermittent failure in rpc_net.py --v2transport

0487f91 test: Fix intermittent failure in rpc_net.py --v2transport (stratospher)

Pull request description:

  Fixes #29508.

  Make sure that v2 handshake is complete before comparing getpeerinfo outputs so that `transport_protocol_type` isn't stuck at 'detecting'.

  This is done by adding a wait_until statement till `transport_protocol_type = v2`  so that bitcoind waits until the v2 handshake is complete. (on the python side, this is ensured by default since `wait_for_handshake = True`  inside `add_p2p_connection()`)

ACKs for top commit:
  Sjors:
    ACK 0487f91
  mzumsande:
    Code Review ACK 0487f91
  achow101:
    ACK 0487f91
  vasild:
    ACK 0487f91

Tree-SHA512: 44dd646a61cd38da243f527df7321e22d1821c2b090be43673027746098caf450c6671708ed731ba257952df6b5886e64c9c2f9686a82f6ef0f25780b7a87d3d

Author: achow101

test/functional/rpc_net.py

@@ -113,6 +113,8 @@ def test_getpeerinfo(self):
         self.nodes[0].setmocktime(no_version_peer_conntime)
         with self.nodes[0].wait_for_new_peer():
             no_version_peer = self.nodes[0].add_p2p_connection(P2PInterface(), send_version=False, wait_for_verack=False)
+        if self.options.v2transport:
+            self.wait_until(lambda: self.nodes[0].getpeerinfo()[no_version_peer_id]["transport_protocol_type"] == "v2")
         self.nodes[0].setmocktime(0)
         peer_info = self.nodes[0].getpeerinfo()[no_version_peer_id]
         peer_info.pop("addr")