Given a CF template that defines outputs as named exports, I expect the "describe-stack" endpoint to include the exported names. With localstack, that is currently not the case.

Example template:
```yaml
  Outputs:
    VPCId:
      Value: {Ref: MyVPC}
      Export:
        Name: My-VPCId

  Resources:
    MyVPC:
      Properties:
        CidrBlock: 10.0.0.0/16
      Type: AWS::EC2::VPC

```

AWS:
```
$ aws cloudformation describe-stacks
...
                {
                    "OutputKey": "VPCId",
                    "OutputValue": "vpc-0123456789",
                    "ExportName": "My-VPCId"
                },

```

localstack:
```
$ aws cloudformation --endpoint-url=http://localhost:4581/ describe-stacks
...
                {
                    "OutputKey": "VPCId",
                    "OutputValue": "vpc-0123456789"
                },
...
```
resource_map_new = dict(resources_map._resource_json_map)
        resource_map_new[logical_id] = resource_json
        should_be_created = template_deployer.should_be_deployed(logical_id, resource_map_new, stack_name)
        
        resource_json_arns_fixed = clone(json_safe(convert_objs_to_ids(resource_json)))
        set_moto_account_ids(resource_json_arns_fixed)
        
        if (resource or update) and not force_create:
            parse_and_update_resource_orig(logical_id,
                resource_json_arns_fixed, resources_map, region_name)
        elif not resource:
            try:
                resource = parse_and_create_resource_orig(logical_id,
                    resource_json_arns_fixed, resources_map, region_name)
            except Exception as e:
                if should_be_created:
                    raise
                else:
                    LOG.info('Error on moto CF resource creation. Ignoring, as should_be_created=%s: %s' %
                             (should_be_created, e))
        
        if hasattr(resource, 'region_name') and resource.region_name != region_name:
            LOG.debug('Updating incorrect region from %s to %s' % (resource.region_name, region_name))
            resource.region_name = region_name
        
        is_updateable = False
        if not should_be_created:
            
            is_updateable = template_deployer.is_updateable(logical_id, resource_map_new, stack_name)