Merge pull request #5408 from cs2be/ADD_PRINT_OPERATOR_IN_DOCKER

Please refer to https://github.com/PaddlePaddle/Paddle/issues/5363

paddle/scripts/docker/build.sh

@@ -168,6 +168,7 @@ EOF
     ${DOCKERFILE_GPU_ENV}
     ADD go/cmd/pserver/pserver /usr/bin/
     ADD go/cmd/master/master /usr/bin/
+    ADD paddle/pybind/print_operators_doc /usr/bin/
     # default command shows the paddle version and exit
     CMD ["paddle", "version"]
 EOF