clean for protobuf installation
clean for protobuf installation

redtankd/rust-test,redtankd/rust-test,redtankd/github-test,redtankd/rust-test,redtankd/rust-test,redtankd/github-test,redtankd/rust-test,redtankd/github-test,redtankd/rust-test,redtankd/github-test