message: log why a start training request is rejected
diff: @@ -263,7 +263,7 @@ impl Protocol {
  info!("accepting start training request");
  StartTrainingResponse::Accept
  } else {
  - info!("rejecting start training request");
  + info!("rejecting start training request (client state = {}, training_complete = {}", client_state, self.is_training_complete);
  StartTrainingResponse::Reject
  }
  }
  