Created by: zhhsplendid

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Add 3 Tests for V2 APIs for Dy2stat:

test_resnet_v2.py test_simnet_v2.py test_ptb_lm_v2.py

We used tool from https://www.paddlepaddle.org.cn/documentation/docs/zh/2.0-beta/guides/migration_cn.html#paddle1-xpaddle2-0beta to do v1.x to v2 transformation.

This PR pulled changes from https://github.com/PaddlePaddle/Paddle/pull/27430, please DO NOT merge before https://github.com/PaddlePaddle/Paddle/pull/27430 is merged