Merge bitcoin/bitcoin#25914: test: Fix intermittent issue in p2p_leak.py

fa2aae5 test: Fix intermittent issue in p2p_leak.py (MacroFake)

Pull request description:

  Diff to reproduce:

  ```diff
  diff --git a/src/net.cpp b/src/net.cpp
  index 865ce2e..ccf289d77b 100644
  --- a/src/net.cpp
  +++ b/src/net.cpp
  @@ -1150,6 +1150,7 @@ bool CConnman::InactivityCheck(const CNode& node) const

       if (last_recv.count() == 0 || last_send.count() == 0) {
           LogPrint(BCLog::NET, "socket no message in first %i seconds, %d %d peer=%d\n", count_seconds(m_peer_connect_timeout), last_recv.count() != 0, last_send.count() != 0, node.GetId());
  +        UninterruptibleSleep(6s);
           return true;
       }

  ```

  Example in CI:

  ```
   node0 2022-08-12T09:51:56.015288Z [net] [net.cpp:1152] [InactivityCheck] [net] socket no message in first 3 seconds, 0 0 peer=0
   test  2022-08-12T09:51:57.658000Z TestFramework (ERROR): Assertion failed
                                     Traceback (most recent call last):
                                       File "/tmp/cirrus-ci-build/ci/scratch/build/bitcoin-x86_64-pc-linux-gnu/test/functional/test_framework/test_framework.py", line 133, in main
                                         self.run_test()
                                       File "/tmp/cirrus-ci-build/ci/scratch/build/bitcoin-x86_64-pc-linux-gnu/test/functional/p2p_leak.py", line 155, in run_test
                                         assert not no_version_idle_peer.is_connected
                                     AssertionError
  ```

  https://cirrus-ci.com/task/5346634421764096?logs=ci#L3683

ACKs for top commit:
  satsie:
    ACK fa2aae5
  luke-jr:
    tACK fa2aae5

Tree-SHA512: e6ddf5b985f7da365b18b699ff8d0719b71b44e4e6bc5576d4099d1bad2c702495afd85f69f4edba89a883e13756a340946db2e7f4be41b1ac0e3c4f515ca4fd

Author: fanquake

test/functional/p2p_leak.py

@@ -138,6 +138,9 @@ def run_test(self):
         # Give the node enough time to possibly leak out a message
         time.sleep(PEER_TIMEOUT + 2)
 
+        self.log.info("Connect peer to ensure the net thread runs the disconnect logic at least once")
+        self.nodes[0].add_p2p_connection(P2PInterface())
+
         # Make sure only expected messages came in
         assert not no_version_idle_peer.unexpected_msg
         assert not no_version_idle_peer.got_wtxidrelay
@@ -169,7 +172,7 @@ def run_test(self):
 
         self.log.info('Check that old peers are disconnected')
         p2p_old_peer = self.nodes[0].add_p2p_connection(P2PInterface(), send_version=False, wait_for_verack=False)
-        with self.nodes[0].assert_debug_log(['peer=4 using obsolete version 31799; disconnecting']):
+        with self.nodes[0].assert_debug_log(["using obsolete version 31799; disconnecting"]):
             p2p_old_peer.send_message(self.create_old_version(31799))
             p2p_old_peer.wait_for_disconnect()