test: p2p: check disconnect due to lack of desirable service flags

test/functional/test_runner.py

@@ -395,6 +395,8 @@ BASE_SCRIPTS = [
     'rpc_getdescriptorinfo.py',
     'rpc_mempool_info.py',
     'rpc_help.py',
+    'p2p_handshake.py',
+    'p2p_handshake.py --v2transport',
     'feature_dirsymlinks.py',
     'feature_help.py',
     'feature_shutdown.py',