message: test: Remove unused self.connect_nodes
  The nodes are stopped in the next line, no need to connect them
diff: @@ -103,7 +103,6 @@ class MempoolPersistTest(BitcoinTestFramework):
  assert_equal(len(self.nodes[0].getpeerinfo()), 0)
  assert_equal(len(self.nodes[0].p2ps), 0)
  self.mini_wallet.send_self_transfer(from_node=self.nodes[0])
  - self.connect_nodes(0, 2)
  self.log.debug("Stop-start the nodes. Verify that node0 has the transactions in its mempool and node1 does not. Verify that node2 calculates its balance correctly after loading wallet transactions.")
  self.stop_nodes()
  