Normalize CLI commands to have a single trailing newline.

        :param command: Command that may require line feed to be normalized
        :type command: str

def normalize_cmd(self, command):
        """Normalize CLI commands to have a single trailing newline.

        :param command: Command that may require line feed to be normalized
        :type command: str
        """
        command = command.rstrip()
        command += self.RETURN
        return command