message: config: move logging of full response to trace logging
  With large response bodies, this tends to seize up the proccess due to
  log volume, making debug logging not very useful. This drops logging the
  entire update to trace.
diff: @@ -56,8 +56,9 @@ public:
  stats_.update_success_.inc();
  stats_.update_attempt_.inc();
  stats_.version_.set(HashUtil::xxHash64(version_info));
  - ENVOY_LOG(debug, "gRPC config for {} accepted with {} resources: {}", type_url_,
  - resources.size(), RepeatedPtrUtil::debugString(typed_resources));
  + ENVOY_LOG(debug, "gRPC config for {} accepted with {} resources with version {}", type_url_,
  + resources.size(), version_info);
  + ENVOY_LOG(trace, "resources: {}", RepeatedPtrUtil::debugString(typed_resources));
  }
  void onConfigUpdateFailed(const EnvoyException* e) override {
  