test: speedup wallet tests by whitelisting peers (immediate tx relay)

test/functional/wallet_listreceivedby.py

@@ -18,6 +18,8 @@ from test_framework.wallet_util import test_address
 class ReceivedByTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 2
+        # whitelist peers to speed up tx relay / mempool sync
+        self.extra_args = [["-whitelist=noban@127.0.0.1"]] * self.num_nodes
 
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()