test: add functional test for deadlock situation

test/functional/test_runner.py

@@ -267,6 +267,7 @@ BASE_SCRIPTS = [
     'p2p_leak_tx.py',
     'p2p_eviction.py',
     'p2p_ibd_stalling.py',
+    'p2p_net_deadlock.py',
     'wallet_signmessagewithaddress.py',
     'rpc_signmessagewithprivkey.py',
     'rpc_generate.py',