Use proper tar command to unzip node js.
Use proper tar command to unzip node js.

Change-Id: I7bff2b7c58de9f5ee127aae75e9561af9b4cc660

cloudendpoints/esp,cloudendpoints/esp,cloudendpoints/esp,cloudendpoints/esp,cloudendpoints/esp,cloudendpoints/esp,cloudendpoints/esp,cloudendpoints/esp