Time interval checkpointing fix

[maanug-nv]

What does this PR do ?

Missing baseclass call. Fixes checkpointing with train_time_interval

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[maanug-nv]

One consideration is whether to call the base class's impl at the start or end of our impl. If we do it at the start, we are timing these file operations as part of the first train time interval. So, I think it makes more sense to do it at the end.

[ashors1]

One consideration is whether to call the base class's impl at the start or end of our impl. If we do it at the start, we are timing these file operations as part of the first train time interval. So, I think it makes more sense to do it at the end.

Thanks Maanu! I agree that it makes more sense to add the call at the end.