I created a CloudFormation stack using the template below via Boto3 Python method `cf_client.create_stack(StackName="test")`; however, when I attempt to call `s3_client.get_bucket_policy(Bucket="my-bucket")` I receive a `NoSuchBucketPolicy ... The bucket policy does not exist` error. 

```yaml
---
AWSTemplateFormatVersion: "2010-09-09"
Description: A sample template

Resources:
  TestBucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: my-bucket
      AccessControl: PublicRead
      BucketEncryption:
        ServerSideEncryptionConfiguration:
          - ServerSideEncryptionByDefault:
              SSEAlgorithm: AES256

  TestBucketPolicy:
    Type: AWS::S3::BucketPolicy
    Properties:
      Bucket:
        Ref: TestBucket
      PolicyDocument:
        Id: TestBucketPolicy
        Statement:
          - Action:
              - "s3:GetObject"
            Effect: "Allow"
            Resource:
              Fn::Join:
                - ""
                - - "arn:aws:s3:::"
                  - Ref: TestBucket
                  - "/*"
            Principal: "*"
            Condition:
              StringLike:
                aws:Referer:
                  - "http://www.example.com/*"
                  - "http://example.com/*"
```

Is this something that's supported? 

Thanks in advance. 
import re
import os
import json
import yaml
import logging
import traceback
import moto.cloudformation.utils
from six import iteritems
from six import string_types
from localstack.utils import common
from localstack.utils.aws import aws_stack
from localstack.utils.testutil import create_zip_file
from localstack.services.awslambda.lambda_api import get_handler_file_from_name
ACTION_CREATE = 'create'
ACTION_DELETE = 'delete'
PLACEHOLDER_RESOURCE_NAME = '__resource_name__'
LOG = logging.getLogger(__name__)
UPDATEABLE_RESOURCES = ['Lambda::Function', 'ApiGateway::Method']
STATIC_REFS = ['AWS::Region', 'AWS::Partition', 'AWS::StackName']
NoDatesSafeLoader = yaml.SafeLoader
NoDatesSafeLoader.yaml_implicit_resolvers = {
    k: [r for r in v if r[0] != 'tag:yaml.org,2002:timestamp'] for
    k, v in NoDatesSafeLoader.yaml_implicit_resolvers.items()
}
def str_or_none(o):