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

test/functional/wallet_hd.py

@@ -20,6 +20,10 @@ class WalletHDTest(BitcoinTestFramework):
         self.setup_clean_chain = True
         self.num_nodes = 2
         self.extra_args = [[], ['-keypool=0']]
+        # whitelist peers to speed up tx relay / mempool sync
+        for args in self.extra_args:
+            args.append("-whitelist=noban@127.0.0.1")
+
         self.supports_cli = False
 
     def skip_test_if_missing_module(self):