It can be deployed normally on AWS

![image](https://user-images.githubusercontent.com/38454210/78279329-f1528180-7549-11ea-8aec-ba9620a16609.png)

![image](https://user-images.githubusercontent.com/38454210/78279477-25c63d80-754a-11ea-92bc-313e7950424c.png)


cf_update_stack_orig = cf_backend.update_stack
        def cf_update_stack(self, *args, **kwargs):
            stack = cf_update_stack_orig(*args, **kwargs)
            
            self._validate_export_uniqueness(stack)
            for export in stack.exports:
                self.exports[export.name] = export
            return stack
        return types.MethodType(cf_update_stack, cf_backend)
    for region, cf_backend in cloudformation_backends.items():
        cf_backend.update_stack = make_cf_update_stack(cf_backend)
    
    def DynamoDB_Table_get_cfn_attribute(self, attribute_name):