Checks if the device is in configuration mode or not.

        Cisco IOS devices abbreviate the prompt at 20 chars in config mode

def check_config_mode(self, check_string=")#", pattern=""):
        """
        Checks if the device is in configuration mode or not.

        Cisco IOS devices abbreviate the prompt at 20 chars in config mode
        """
        return super(CiscoBaseConnection, self).check_config_mode(
            check_string=check_string, pattern=pattern
        )