Exit enable mode.

        :param exit_command: Command that exits the session from privileged mode
        :type exit_command: str

def exit_enable_mode(self, exit_command=""):
        """Exit enable mode.

        :param exit_command: Command that exits the session from privileged mode
        :type exit_command: str
        """
        output = ""
        if self.check_enable_mode():
            self.write_channel(self.normalize_cmd(exit_command))
            output += self.read_until_prompt()
            if self.check_enable_mode():
                raise ValueError("Failed to exit enable mode.")
        return output