title: CLI clearing screen every time I push a key
body: <p>I upgraded from cmd to cmd2 and I am running into a issue. My application is a server and once it receives a connection it prints the following to the screen.</p>
  
  <pre><code>Connected with 127.0.0.1:56653
  </code></pre>
  
  <p>Now I am using netcat for testing as the client for connection and sending to the server. It will print everything I send to it, but then soon as I enter any key on the server, it is all removed as if I cleared the screen.</p>
  
  <pre><code>import cmd2
  import argparse
  import sys
  import socket
  from _thread import *
  
  def recv_data(conn, addr):
      while True:
          data = conn.recv(1024)
          print(data)
  
  def accept_clients(sock):
      while True:
          conn, addr = sock.accept()
  
          print("\nConnected with %s:%s\n" % (addr[0], str(addr[1])))
          start_new_thread(recv_data, (conn,addr))
  
  def start_socket(ip, port):
      sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
      print("Socket created")
  
      try:
          port = int(port)
      except ValueError:
          print("Invalid port number.")
          return
  
      try:
          sock.bind((ip, int(port)))
      except socket.error as msg:
          print("Bind failed. Error Code : %s" % (msg))
          return
  
      print("Socket bind complete")
      sock.listen(5)
      print("Socket now listening")
  
      start_new_thread(accept_clients, (sock,))
  
  
  class CLI(cmd2.Cmd):
      def __init__(self):
          cmd2.Cmd.__init__(self)
          self.prompt = "Server&gt; "
  
  
      def do_listen(self, arg):
          if not arg:
              arg = '-h'
  
          parser = argparse.ArgumentParser(description="Content goes here for information.", epilog="Examples and stuff go here.")
          parser.add_argument('-i', action='store', required=True, dest='ip', help='IP address to listen for connections.')
          parser.add_argument('-p', action='store', required=True, dest='port', help='Port to listen for connections.')
          results = parser.parse_args(arg.split())
  
          start_socket(results.ip, results.port)
  
  
      def do_quit(self, arg):
          sys.exit(1)
      def help_quit(self):
          print("Terminates the application.\n")
  
  cli = CLI()
  cli.cmdloop()
  </code></pre>