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`
Sorry, I didn't catch this before, but it looks like `self.fake_server['lb_info'] = {}` in the `setUp` function - I think it's supposed to be a list of tuples?