message: Eliminate timeout on BeginStep
diff: @@ -228,7 +228,7 @@ public:
  while (true)
  {
  adios2::StepStatus status =
  - reader.BeginStep(adios2::StepMode::NextAvailable, 60.0f);
  + reader.BeginStep(adios2::StepMode::NextAvailable);
  if (status != adios2::StepStatus::OK)
  {
  break;
  