Created by: luotao1

unify ZeroCopy in analysis_test for inference

• Now we only need add following codes in SetConfig function, and use --zero_copy=true to test it.

if (FLAGS_zero_copy) {
    cfg->SwitchUseFeedFetchOps(false);
 }

• for example, commad ./paddle/fluid/inference/tests/api/test_analyzer_pyramid_dnn --infer_model=third_party/inference_demo/pyramid_dnn/model/ --infer_data=third_party/inference_demo/pyramid_dnn/data.txt --gtest_filter=Analyzer_Pyramid_DNN.profile --repeat=1000 --zero_copy=1

• Add TEST(Analyzer_xxx, compare_zero_copy) unit-test to ensure the result of AnalysisConfig and AnalysisConfig + ZeroCopy
• Simpilfy analyzer_rnn1_tester.cc and analyzer_seq_pool1_tester.cc.