>>> cache = Cache(log_level=logging.WARNING)
        >>> def cleanup(self): pass
        >>> cache.replace_cleanup_func(cleanup)
        True
        >>> def cleanup_b(self, other): pass
        >>> cache.replace_cleanup_func(cleanup_b)
        False

def replace_cleanup_func(self, func, only_read=False):
        """
        >>> cache = Cache(log_level=logging.WARNING)
        >>> def cleanup(self): pass
        >>> cache.replace_cleanup_func(cleanup)
        True
        >>> def cleanup_b(self, other): pass
        >>> cache.replace_cleanup_func(cleanup_b)
        False
        """
        self.logger.info('Replace the cleanup function %s ---> %s' % (
            get_function_signature(self.cleanup), get_function_signature(func)))
        self.cleanup = func
        return True