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)


return resolve_ref(stack_name, value['Ref'],
                resources, attribute='PhysicalResourceId')
        if keys_list and keys_list[0].lower() == 'fn::getatt':
            return resolve_ref(stack_name, value[keys_list[0]][0],
                resources, attribute=value[keys_list[0]][1])
        if keys_list and keys_list[0].lower() == 'fn::join':
            join_values = value[keys_list[0]][1]
            join_values = [resolve_refs_recursively(stack_name, v, resources) for v in join_values]
            none_values = [v for v in join_values if v is None]
            if none_values:
                raise Exception('Cannot resolve CF fn::Join %s due to null values: %s' % (value, join_values))
            return value[keys_list[0]][0].join(join_values)
        if keys_list and keys_list[0].lower() == 'fn::sub':
            item_to_sub = value[keys_list[0]]
            if not isinstance(item_to_sub, list):
                attr_refs = dict([(r, {'Ref': r}) for r in STATIC_REFS])
                item_to_sub = [item_to_sub, attr_refs]
            result = item_to_sub[0]
            for key, val in item_to_sub[1].items():
                val = resolve_refs_recursively(stack_name, val, resources)
                result = result.replace('${%s}' % key, val)
            return result
        else:
            for key, val in iteritems(value):
                value[key] = resolve_refs_recursively(stack_name, val, resources)
    if isinstance(value, list):
        for i in range(0, len(value)):
            value[i] = resolve_refs_recursively(stack_name, value[i], resources)
    return value
def get_stack_parameter(stack_name, parameter):