the old protocols are largely untested, mostly unused, and have design
problems that make the RPC transition a lot harder, if not impossible.
in theory we could ship a transparent protocol-converting proxy that'd
isolate the daemon itself from old protocol versions, but that's a lot
of code to maintain for presumably little gain or even no gain at all.
Change-Id: I4c3f3bb34d39044f6aeb07c10caaf13b8340a220
eldritch horrors
fca0a30470