Don't add tf summary when calling AddEvalMetric.
Don't add tf summary when calling AddEvalMetric.

Eval metric summaries are added inside trainer.py.

As a result, eval metrics are no longer reported by 'control' job, but that actually removes some clutter instead because control should be identical to train.

PiperOrigin-RevId: 213532190

tensorflow/lingvo,tensorflow/lingvo,tensorflow/lingvo,tensorflow/lingvo