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:
            return _parse_and_create_resource(logical_id, resource_json, resources_map, region_name)
        except Exception as e:
            LOG.error('Unable to parse and create resource "%s": %s %s' %
                      (logical_id, e, traceback.format_exc()))
            raise
    def parse_and_update_resource(logical_id, resource_json, resources_map, region_name):
        try:
            return _parse_and_create_resource(logical_id,
                resource_json, resources_map, region_name, update=True)
        except Exception as e:
            LOG.error('Unable to parse and update resource "%s": %s %s' %
                      (logical_id, e, traceback.format_exc()))
            raise
    def _parse_and_create_resource(logical_id, resource_json, resources_map, region_name, update=False):
        stack_name = resources_map.get('AWS::StackName')
        resource_hash_key = (stack_name, logical_id)
        
        updating = CURRENTLY_UPDATING_RESOURCES.get(resource_hash_key)
        LOG.debug('Currently updating stack resource %s/%s: %s' % (stack_name, logical_id, updating))
        if updating:
            return None