Merge #18213: test: Fix race in p2p_segwit

fa2cf85e6f test: Fix race in p2p_segwit (MarcoFalke)

Pull request description:

  Fixes #11696

Top commit has no ACKs.

Tree-SHA512: 09de07ea26236547586f5c373a0df2b68d84af5cfa8f40bd2ca9f951fc083c5f4b8a472a60668d99118bbd9f3942ec3d6a34f05944d47345acca41c95475bb27

test/functional/p2p_segwit.py

@@ -147,6 +147,11 @@ class TestP2PConn(P2PInterface):
         super().__init__()
         self.getdataset = set()
 
+    # Avoid sending out msg_getdata in the mininode thread as a reply to invs.
+    # They are not needed and would only lead to races because we send msg_getdata out in the test thread
+    def on_inv(self, message):
+        pass
+
     def on_getdata(self, message):
         for inv in message.inv:
             self.getdataset.add(inv.hash)