Support GoogleNet_v2 in Spark-DL

Googlenet_V2 Model reference [this paper](https://arxiv.org/pdf/1502.03167.pdf).

A caffe model is [here](https://github.com/lim0606/caffe-googlenet-bn/blob/master/train_val.prototxt)

We should achieve 80% intel-caffe single node performance, and achieve same top-1(68%) and top-5(88%) error compare to GPU version on local mode and cluster mode.
