Milo: Internal source should point to internal url
Milo: Internal source should point to internal url

BUG=687289

Review-Url: https://codereview.chromium.org/2662373002

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go