This consolidates tests for getQueryInfo, getArchiveQueryInfo,
getSlotQueryInfo, and similar methods that help application logic
be compatible with different migration stages of different aspects
of the revision storage schema.
Bug: T198561
Change-Id: I8e4ae69d7e00721a0af125afaf9a708f7fe99b0a
This introduces traits for testing different schema variations.
These are not very useful in this patch, but make it much easier
to add tests for MCR schema migration in subsequent patches.
The code in this patch was previously part of If259b1e1c49ceaa4.
Change-Id: I239572f75bebbc9c731a3e3860c4eff179dc15e4
