request_func for remove_from_load_balancer (and friends)

- [x] Mangle `supervisor.SupervisorService`
- [x] Mangle `launch_server_v1.delete_server`
- [x] Mangle `launch_server_v1.remove_from_load_balancer`
Yep, you're right. I kept that from the old code; I think it looks like:

```python
[({"loadBalancerId": '12345'}, {'nodes': [{'id': 'a', 'address': ... }]}),
 ({"loadBalancerId": '54321'}, {'nodes': [{'id': 'b', 'address': ... }]})]
```