Convert the new RPC data into the old data, just enough to keep the
old UI alive against a newer server. This will allow us to build a
final version of the old UI code and run it for quite some time
against a modern REST API.
Users who refuse to upgrade to ChangeScreen2 can run this frozen old
UI build until it no longer works.
Change-Id: Ieef15c39e97673f6bcdeb03567fc48ddbd289a6e
adb91286f8