Merge bitcoin/bitcoin#32063: test: fix intermittent failure in p2p_orphan_handling.py

0294205 test: fix intermittent failure in p2p_orphan_handling.py (Martin Zumsande)

Pull request description:

  If the mocktime is bumped before the node has successfully disconnected the peer, the requests for both parents could be spread over two GETDATAS: The first time `GetRequestsToSend` is invoked it would only request one tx from peer2, because the other one would only be available after peer1  was disconnected and its outstanding txrequest cleared.
  So two GETDATAs would be sent, which would make the test fail.

  Fixes #31700

ACKs for top commit:
  maflcko:
    lgtm ACK 0294205
  instagibbs:
    ACK bitcoin/bitcoin@0294205

Tree-SHA512: 769200898345da197d86d673d9506f08f0a64b72a456e7e7c988ac37450d9c54ec65da1c8447c566c8578f7cfccdc5723ea680e636bfbe0b3d38265e5ef57774

Author: fanquake

test/functional/p2p_orphan_handling.py

@@ -788,6 +788,7 @@ def test_parents_change(self):
 
         # Disconnect peer1. peer2 should become the new candidate for orphan resolution.
         peer1.peer_disconnect()
+        self.wait_until(lambda: node.num_test_p2p_connections() == 1)
         node.bumpmocktime(TXREQUEST_TIME_SKIP)
         self.wait_until(lambda: len(node.getorphantxs(verbosity=2)[0]["from"]) == 1)
         # Both parents should be requested, now that they are both missing.