tests: Whitelist test p2p connection in rpc_packages

test_submit_child_with_parents creates a p2p connection which waits for
the node to announce transactions to it. By whitelisting this
connection, we can reduce the amount of time spent waiting for this
announcement which improves the test runtime and runtime variance.

Author: achow101

test/functional/rpc_packages.py

@@ -29,6 +29,7 @@ class RPCPackagesTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 1
         self.setup_clean_chain = True
+        self.extra_args = [["[email protected]"]] # noban speeds up tx relay
 
     def assert_testres_equal(self, package_hex, testres_expected):
         """Shuffle package_hex and assert that the testmempoolaccept result matches testres_expected. This should only