message: fix draining listener removal logs
diff: @@ -407,7 +407,7 @@ void ListenerManagerImpl::drainListener(ListenerImplPtr&& listener) {
  // Start the drain sequence which completes when the listener's drain manager has completed
  // draining at whatever the server configured drain times are.
  draining_it->listener_->localDrainManager().startDrainSequence([this, draining_it]() -> void {
  - draining_it->listener_->debugLog("removing listener");
  + draining_it->listener_->debugLog("removing draining listener");
  for (const auto& worker : workers_) {
  // Once the drain time has completed via the drain manager's timer, we tell the workers
  // to remove the listener.
  @@ -417,7 +417,7 @@ void ListenerManagerImpl::drainListener(ListenerImplPtr&& listener) {
  // while filters might still be using its context (stats, etc.).
  server_.dispatcher().post([this, draining_it]() -> void {
  if (--draining_it->workers_pending_removal_ == 0) {
  - draining_it->listener_->debugLog("listener removal complete");
  + draining_it->listener_->debugLog("draining listener removal complete");
  draining_listeners_.erase(draining_it);
  stats_.total_listeners_draining_.set(draining_listeners_.size());
  }
  