fix invalid train flags in unit test
fix invalid train flags in unit test

jsenellart-systran/OpenNMT,da03/OpenNMT,jsenellart/OpenNMT,jungikim/OpenNMT,monsieurzhang/OpenNMT,jsenellart/OpenNMT,jsenellart-systran/OpenNMT,OpenNMT/OpenNMT,jungikim/OpenNMT,monsieurzhang/OpenNMT,monsieurzhang/OpenNMT,OpenNMT/OpenNMT,da03/OpenNMT,jsenellart/OpenNMT,jsenellart-systran/OpenNMT,jungikim/OpenNMT,OpenNMT/OpenNMT,da03/OpenNMT