Connect using the Telnet protocol specific FSM.

def connect(self, driver):
        """Connect using the Telnet protocol specific FSM."""
        #              0            1                              2                      3
        events = [ESCAPE_CHAR, driver.press_return_re, driver.standby_re, driver.username_re,
                  #            4                   5                  6                     7
                  driver.password_re, driver.more_re, self.device.prompt_re, driver.rommon_re,
                  #       8                              9              10            11              12
                  driver.unable_to_connect_re, driver.timeout_re, pexpect.TIMEOUT, PASSWORD_OK, driver.syntax_error_re]

        transitions = [
            (ESCAPE_CHAR, [0], 1, None, _C['esc_char_timeout']),
            (driver.syntax_error_re, [0], -1, CommandSyntaxError("Command syntax error"), 0),
            (driver.press_return_re, [0, 1], 1, a_send_newline, 10),
            (PASSWORD_OK, [0, 1], 1, a_send_newline, 10),
            (driver.standby_re, [0, 5], -1, partial(a_standby_console), 0),
            (driver.username_re, [0, 1, 5, 6], -1, partial(a_save_last_pattern, self), 0),
            (driver.password_re, [0, 1, 5], -1, partial(a_save_last_pattern, self), 0),
            (driver.more_re, [0, 5], 7, partial(a_send, "q"), 10),
            # router sends it again to delete
            (driver.more_re, [7], 8, None, 10),
            # (prompt, [0, 1, 5], 6, a_send_newline, 10),
            (self.device.prompt_re, [0, 1, 5], 0, None, 10),
            (self.device.prompt_re, [6, 8, 5], -1, partial(a_save_last_pattern, self), 0),
            (driver.rommon_re, [0, 1, 5], -1, partial(a_save_last_pattern, self), 0),
            (driver.unable_to_connect_re, [0, 1, 5], -1, a_unable_to_connect, 0),
            (driver.timeout_re, [0, 1, 5], -1, ConnectionTimeoutError("Connection Timeout", self.hostname), 0),
            (pexpect.TIMEOUT, [0, 1], 5, a_send_newline, 10),
            (pexpect.TIMEOUT, [5], -1, ConnectionTimeoutError("Connection timeout", self.hostname), 0)
        ]

        self.log("EXPECTED_PROMPT={}".format(pattern_to_str(self.device.prompt_re)))
        # setting max_transitions to large number to swallow prompt like strings from prompt
        fsm = FSM("TELNET-CONNECT", self.device, events, transitions, timeout=_C['connect_timeout'],
                  init_pattern=self.last_pattern, max_transitions=500)
        return fsm.run()