message: tests: Support calling add_nodes more than once
diff: @@ -292,7 +292,8 @@ class BitcoinTestFramework(metaclass=BitcoinTestMetaClass):
  assert_equal(len(extra_args), num_nodes)
  assert_equal(len(binary), num_nodes)
  for i in range(num_nodes):
  - self.nodes.append(TestNode(i, get_datadir_path(self.options.tmpdir, i), rpchost=rpchost, timewait=self.rpc_timewait, bitcoind=binary[i], bitcoin_cli=self.options.bitcoincli, mocktime=self.mocktime, coverage_dir=self.options.coveragedir, extra_conf=extra_confs[i], extra_args=extra_args[i], use_cli=self.options.usecli))
  + numnode = len(self.nodes)
  + self.nodes.append(TestNode(numnode, get_datadir_path(self.options.tmpdir, numnode), rpchost=rpchost, timewait=self.rpc_timewait, bitcoind=binary[i], bitcoin_cli=self.options.bitcoincli, mocktime=self.mocktime, coverage_dir=self.options.coveragedir, extra_conf=extra_confs[i], extra_args=extra_args[i], use_cli=self.options.usecli))
  def start_node(self, i, *args, **kwargs):
  """Start a bitcoind"""
  