Kill tests/fixture-data with fire

[Yawning]

JSON documents with account addresses that come from god only knows where is a monumental pain in the ass to maintain.

As cute as the idea is, we should probably just hard code the documents into the relevant test cases so we can do things like "Automatically derive the addresses from public keys", so that the next victim that has to update these things en-mass isn't stuck trying to figure out where they came from.