Created by: wojtuss

This PR is a redesigned version of https://github.com/PaddlePaddle/Paddle/pull/13369/

This patch adds a C-API test for ResNet50 with support for MKL-DNN and fuses implemented using Pass. Also, it adds support for choosing passes to be executed in a given order. The environment flag FLAGS_use_mkldnn is handled. Different sequences of passes can be chosen in case MKL-DNN is enabled or not. For now, only fake imagenet data is supported.