[test] test that an invalid GETDATA doesn't prevent processing of future messages

Co-Authored-By: John Newbery <john@johnnewbery.com>

test/functional/test_runner.py

@@ -151,6 +151,7 @@ BASE_SCRIPTS = [
     'rpc_deprecated.py',
     'wallet_disable.py',
     'p2p_addr_relay.py',
+    'p2p_getdata.py',
     'rpc_net.py',
     'wallet_keypool.py',
     'wallet_keypool.py --descriptors',