Merge bitcoin/bitcoin#29893: test: fix intermittent failure in p2p_compactblocks_hb.py

1ae5b20 test: fix intermittent failure in p2p_compactblocks_hb.py (Martin Zumsande)

Pull request description:

  Fixes #29860

  As a result of node1 receiving a block, it sends out SENDCMPCT messages to some of its peers to update the high-bandwidth status. We need to wait until those are received and processed by the peers to avoid intermittent failures. Before, we'd only wait until all peers have synced with the new block (within `generate`) which is not sufficient.

  I could reproduce the failure by adding a `std::this_thread::sleep_for(std::chrono::milliseconds(1000));` sleep to the [net_processing code](https://github.com/bitcoin/bitcoin/blob/c7567d9223a927a88173ff04eeb4f54a5c02b43d/src/net_processing.cpp#L3763) that processes `NetMsgType::SENDCMPCT`.

ACKs for top commit:
  instagibbs:
    ACK 1ae5b20
  alfonsoromanz:
    Tested ACK 1ae5b20
  glozow:
    ACK 1ae5b20

Tree-SHA512: 47c29616e73a5e0ff966fc231e4f672c1a6892511e5c10a3905b30ad6b2a3d1267fa0a88bd8f64b523fe580199d22a43545c84e361879e5096483152065c4b9a

Author: glozow

test/functional/p2p_compactblocks_hb.py

@@ -32,10 +32,15 @@ def relay_block_through(self, peer):
         self.connect_nodes(peer, 0)
         self.generate(self.nodes[0], 1)
         self.disconnect_nodes(peer, 0)
-        status_to = [self.peer_info(1, i)['bip152_hb_to'] for i in range(2, 6)]
-        status_from = [self.peer_info(i, 1)['bip152_hb_from'] for i in range(2, 6)]
-        assert_equal(status_to, status_from)
-        return status_to
+
+        def status_to():
+            return [self.peer_info(1, i)['bip152_hb_to'] for i in range(2, 6)]
+
+        def status_from():
+            return [self.peer_info(i, 1)['bip152_hb_from'] for i in range(2, 6)]
+
+        self.wait_until(lambda: status_to() == status_from())
+        return status_to()
 
     def run_test(self):
         self.log.info("Testing reserved high-bandwidth mode slot for outbound peer...")