[tf.contrib.seq2seq] Fix handling of sequence_length w/ beam search decoder. Change by Ran Tian; I'm just copying it here with minor cleanup. Fix a bug of tf.contrib.seq2seq.dynamic_decode. When used with a tf.contrib.seq2seq.BeamSearchDecoder, the BeamSearchDecoder shuffles its beams at each step, which conflicts with the `dynamic_decode` function's tracking of finished states. Therefore, the flag decoder.tracks_own_finished is turned on, and the finished states are correctly handled. However, `sequence_lenghts` is also shuffled by the BeamSearchDecoder, but this was not correctly handled previously. As a result, the `final_sequence_lengths` returned by `dynamic_decode` was not correct. This fix updates the `sequence_lengths` from the returned decoder_state of BeamSearchDecoder. PiperOrigin-RevId: 268056568
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