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"
                },
...
```
if not update or not is_updateable:
                all_satisfied = template_deployer.all_resource_dependencies_satisfied(
                    logical_id, resource_map_new, stack_name)
                if not all_satisfied:
                    LOG.info('Resource %s cannot be deployed, found unsatisfied dependencies. %s' % (
                        logical_id, resource_json))
                    details = [logical_id, resource_json, resources_map, region_name]
                    resources_map._unresolved_resources = getattr(resources_map, '_unresolved_resources', {})
                    resources_map._unresolved_resources[logical_id] = details
                else:
                    LOG.debug('Resource %s need not be deployed (is_updateable=%s): %s %s' % (
                        logical_id, is_updateable, resource_json, bool(resource)))
                
                
                
                return resource
        
        update_resource_name(resource, resource_json)
        LOG.debug('Deploying CloudFormation resource (update=%s, exists=%s, updateable=%s): %s' %
                  (update, not should_be_created, is_updateable, resource_json))
        try:
            CURRENTLY_UPDATING_RESOURCES[resource_hash_key] = True
            deploy_func = template_deployer.update_resource if update else template_deployer.deploy_resource
            result = deploy_func(logical_id, resource_map_new, stack_name=stack_name)
        finally:
            CURRENTLY_UPDATING_RESOURCES[resource_hash_key] = False
        if not should_be_created:
            
            return resource
        def find_id(resource):