Transpiler: fix pserver crash due to split var name check.
Transpiler: fix pserver crash due to split var name check.

In notest_dist_label_semantic_roles.py, "emb" is matched with
"embedding_1.w_0", but they are two irrevalent vars.

Fixes: https://github.com/PaddlePaddle/Paddle/issues/7701

Canpio/Paddle,PaddlePaddle/Paddle,pkuyym/Paddle,pkuyym/Paddle,pkuyym/Paddle,tensor-tang/Paddle,PaddlePaddle/Paddle,jacquesqiao/Paddle,pkuyym/Paddle,reyoung/Paddle,reyoung/Paddle,Canpio/Paddle,Canpio/Paddle,PaddlePaddle/Paddle,QiJune/Paddle,baidu/Paddle,reyoung/Paddle,Canpio/Paddle,QiJune/Paddle,luotao1/Paddle,reyoung/Paddle,jacquesqiao/Paddle,baidu/Paddle,luotao1/Paddle,reyoung/Paddle,QiJune/Paddle,Canpio/Paddle,QiJune/Paddle,PaddlePaddle/Paddle,QiJune/Paddle,jacquesqiao/Paddle,reyoung/Paddle,pkuyym/Paddle,putcn/Paddle,baidu/Paddle,jacquesqiao/Paddle,Canpio/Paddle,chengduoZH/Paddle,luotao1/Paddle,lcy-seso/Paddle,putcn/Paddle,PaddlePaddle/Paddle,PaddlePaddle/Paddle,tensor-tang/Paddle,lcy-seso/Paddle,luotao1/Paddle,jacquesqiao/Paddle,Canpio/Paddle,luotao1/Paddle,lcy-seso/Paddle,pkuyym/Paddle,tensor-tang/Paddle,tensor-tang/Paddle,QiJune/Paddle,PaddlePaddle/Paddle,Canpio/Paddle,tensor-tang/Paddle,putcn/Paddle,chengduoZH/Paddle,putcn/Paddle,chengduoZH/Paddle,baidu/Paddle,putcn/Paddle,putcn/Paddle,lcy-seso/Paddle,lcy-seso/Paddle,jacquesqiao/Paddle,luotao1/Paddle,baidu/Paddle,chengduoZH/Paddle,luotao1/Paddle,chengduoZH/Paddle,lcy-seso/Paddle