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

test/functional/wallet_abandonconflict.py

@@ -24,6 +24,9 @@ class AbandonConflictTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 2
         self.extra_args = [["-minrelaytxfee=0.00001"], []]
+        # whitelist peers to speed up tx relay / mempool sync
+        for args in self.extra_args:
+            args.append("-whitelist=noban@127.0.0.1")
 
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()