Update link template to AppEngine Version management
Update link template to AppEngine Version management

New link does not require to re-authenticate each time.

R=maruel@chromium.org, vadimsh@chromium.org

Review-Url: https://codereview.chromium.org/2572193002

luci/luci-py,luci/luci-py,luci/luci-py,luci/luci-py