input: Write a python function to create an SSH tunnel on a remote port using the paramiko library.
  ```python
  assert createTunnelOnRemotePort(None, 'example.com', 22) is not None
  assert createTunnelOnRemotePort(None, 'example.com', 2222) is not None
  assert createTunnelOnRemotePort(None, 'example.com', 80) is not None
output: import paramiko
  
  def createTunnelOnRemotePort(local_port, remote_host, remote_port):
      ssh = paramiko.SSHClient()
      ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
      ssh.connect(remote_host, port=remote_port)
      
      transport = ssh.get_transport()
      local_port = local_port if local_port is not None else 0  # Auto-select if local_port is None
      
      forward_tunnel = transport.open_channel(
          "direct-tcpip",
          (remote_host, remote_port),
          ('localhost', local_port)
      )
      return forward_tunnel