We're using an old version of `boto` (through `moto`) to detect the available regions for Lambda (and other APIs). We should switch from `boto` to the newer `boto3` library, which includes the up-to-date endpoints.

```
code/localstack/localstack/services/cloudformation/cloudformation_starter.py", line 502, in Lambda_create_from_cloudformation_json
    return Lambda_create_from_cloudformation_json_orig(resource_name, cloudformation_json, region_name)
  File "/opt/code/localstack/.venv/lib/python3.7/site-packages/moto/awslambda/models.py", line 519, in create_from_cloudformation_json
    backend = lambda_backends[region_name]
KeyError: 'eu-west-2'
```
try:
            if attribute_name == 'StreamArn':
                streams = aws_stack.connect_to_service('dynamodbstreams').list_streams(TableName=self.name)['Streams']
                return streams[0]['StreamArn'] if streams else None
            return DynamoDB_Table_get_cfn_attribute_orig(self, attribute_name)
        except Exception as e:
            LOG.warning('Unable to get attribute "%s" from resource %s: %s' % (attribute_name, type(self), e))
            raise
    DynamoDB_Table_get_cfn_attribute_orig = dynamodb_models.Table.get_cfn_attribute
    dynamodb_models.Table.get_cfn_attribute = DynamoDB_Table_get_cfn_attribute
    
    def IAM_Role_get_cfn_attribute(self, attribute_name):
        try:
            return IAM_Role_get_cfn_attribute_orig(self, attribute_name)
        except Exception:
            if attribute_name == 'Arn':
                return aws_stack.role_arn(self.name)
            raise
    IAM_Role_get_cfn_attribute_orig = iam_models.Role.get_cfn_attribute
    iam_models.Role.get_cfn_attribute = IAM_Role_get_cfn_attribute
    
    def SNS_Topic_get_cfn_attribute(self, attribute_name):