It is my understanding that setting an environment varialbe `TEST_AWS_ACCOUNT_ID` for localstack sets that as the AWS account for the user in localstack.

However, setting it does not actually change any ARNs. For example:

1. Start localstack using `TEST_AWS_ACCOUNT_ID="111111111111" DEBUG=1 localstack start`
2. Deploy anything with an ARN (in this example I deployed a lambda)
3. Check the ARN. Example output for lambda:
```json
$ awslocal lambda list-functions
{
    "Functions": [
        {
            "FunctionName": "localtest-local-hello",
            "FunctionArn": "arn:aws:lambda:us-east-1:000000000000:function:localtest-local-hello",
            "Runtime": "nodejs10.x",
            "Role": "test_role",
            "Handler": "handler.hello",
            "CodeSize": 3077,
            "Description": "",
            "Timeout": 6,
            "MemorySize": 1024,
            "LastModified": "2019-11-06T06:43:53.451+0000",
            "CodeSha256": "V77gR13o90ET7+XquXBBc3Rxr1qDu1bE7S+A0Wbx5ys=",
            "Version": "$LATEST",
            "TracingConfig": {
                "Mode": "PassThrough"
            },
            "RevisionId": "3d4ed679-c1a9-4b7e-ad9e-f27e8543c5e9"
        }
    ]
}
```

ARN is still 000000000000
""" Convert a CloudFormation ACL string (e.g., 'PublicRead') to an S3 ACL string (e.g., 'public-read') """
    return re.sub('(?<!^)(?=[A-Z])', '-', acl).lower()
def retrieve_topic_arn(topic_name):
    topics = aws_stack.connect_to_service('sns').list_topics()['Topics']
    topic_arns = [t['TopicArn'] for t in topics if t['TopicArn'].endswith(':%s' % topic_name)]
    return topic_arns[0]
def get_role_arn(role_arn, **kwargs):
    role_arn = resolve_refs_recursively(kwargs.get('stack_name'), role_arn, kwargs.get('resources'))
    return aws_stack.role_arn(role_arn)
def parse_template(template):
    try:
        return json.loads(template)
    except Exception:
        yaml.add_multi_constructor('', moto.cloudformation.utils.yaml_tag_constructor)
        try:
            return yaml.safe_load(template)
        except Exception:
            return yaml.load(template, Loader=yaml.Loader)
def template_to_json(template):
    template = parse_template(template)
    return json.dumps(template)
def get_resource_type(resource):
    res_type = resource.get('ResourceType') or resource.get('Type') or ''
    parts = res_type.split('::', 1)
    if len(parts) == 1:
        return None
    return parts[1]
def get_service_name(resource):