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'
```
from moto.cloudwatch import models as cw_models
from moto.cloudformation import parsing, responses
from boto.cloudformation.stack import Output
from moto.cloudformation.exceptions import ValidationError, UnformattedGetAttTemplateException
from localstack import config
from localstack.constants import DEFAULT_PORT_CLOUDFORMATION_BACKEND, TEST_AWS_ACCOUNT_ID, MOTO_ACCOUNT_ID
from localstack.utils.aws import aws_stack, aws_responses
from localstack.utils.common import FuncThread, short_uid, recurse_object, clone, json_safe
from localstack.stepfunctions import models as sfn_models
from localstack.services.infra import (
    get_service_protocol, start_proxy_for_service, do_run, canonicalize_api_names)
from localstack.utils.bootstrap import setup_logging
from localstack.utils.cloudformation import template_deployer
from localstack.services.cloudformation import service_models
from localstack.services.awslambda.lambda_api import BUCKET_MARKER_LOCAL
LOG = logging.getLogger(__name__)
CURRENTLY_UPDATING_RESOURCES = {}
RUN_SERVER_IN_PROCESS = False
MODEL_MAP = {
    'AWS::StepFunctions::Activity': service_models.StepFunctionsActivity,
    'AWS::SNS::Subscription': service_models.SNSSubscription,
    'AWS::ApiGateway::GatewayResponse': service_models.GatewayResponse,
    'AWS::ApiGateway::Deployment': apigw_models.Deployment,
    'AWS::ApiGateway::Method': apigw_models.Method,
    'AWS::ApiGateway::Resource': apigw_models.Resource,
    'AWS::ApiGateway::RestApi': apigw_models.RestAPI,
    'AWS::StepFunctions::StateMachine': sfn_models.StateMachine,
    'AWS::CloudFormation::Stack': service_models.CloudFormationStack
}
def start_cloudformation(port=None, asynchronous=False, update_listener=None):