'Create new TelnetRepl with the following initial values:
encoding: one of python accepted encoding used to encode commands and decode responses
external_id: external, persisten name of this repl used to find it later
host: telnet host to connect to
port: telnet port to connect to
cmd_postfix: some REPLS require you to end a command with a postfix to begin execution,
think \';\' or \'.\', you can force repl to add it automatically'

def __init__(self, encoding, host='localhost', port=23, **kwds):

    super(TelnetRepl, self).__init__(encoding, **kwds)
    self._telnet = telnetlib.Telnet()
    self._telnet.open(host, int(port))
    self._alive = True
    self._killed = False
