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test pipeline, why not returning 1 on python test error??????

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This change captures the exit code from the python unit tests. This now results in a failed build as the tests cannot find the python -> c++ bindings. This appears...

Update for protobuf version range, breaks with v3 protobuf

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Building source as per [](https://singa.incubator.apache.org/en/docs/installation.html) from with the `USE_MODULES=ON` flag pulls in protobuf 3.3.0 and the compilation fails with message `/src/caffe.pb.cc:31115:35: error: ‘MergeFromFail’ is not a member of ‘google::protobuf::internal’ ::google::protobuf::internal::MergeFromFail(__FILE__,...