message: Improving incarnation id error message.
diff: @@ -204,7 +204,9 @@ class MultiDeviceIterator : public ResourceBase {
  MultiDeviceIteratorCallback callback) {
  HostBufferElement elem;
  if (incarnation_id_ != incarnation_id) {
  - elem.status = errors::InvalidArgument("Invalid incarnation id");
  + elem.status = errors::InvalidArgument(
  + "Invalid incarnation id. Provided: ", incarnation_id,
  + "; Expected: ", incarnation_id_);
  callback(elem);
  return;
  }
  