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'
```
props = cloudformation_json['Properties']
        name = props['Name']
        region_name = props.get('Region') or aws_stack.get_region()
        description = props.get('Description') or ''
        id = props.get('Id') or short_uid()
        return apigw_models.RestAPI(id, region_name, name, description)
    def RestAPI_get_cfn_attribute(self, attribute_name):
        if attribute_name == 'Id':
            return self.id
        if attribute_name == 'Region':
            return self.region_name
        if attribute_name == 'Name':
            return self.name
        if attribute_name == 'Description':
            return self.description
        if attribute_name == 'RootResourceId':
            for id, resource in self.resources.items():
                if resource.parent_id is None:
                    return resource.id
            return None
        raise UnformattedGetAttTemplateException()
    @classmethod
    def Deployment_create_from_cloudformation_json(cls, resource_name, cloudformation_json, region_name):