Update release-tag-git (#268)
Update release-tag-git (#268)

* Update release-tag-git

replaced https://github.com/cloudendpoints/esp with "upstream" for consistency with other script.

* Update release-tag-git

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