Use the correct database for fetching app upgrade info.
Review Request #10579 — Created June 5, 2019 and submitted
We had a couple calls that used the default database, breaking
operations when testing against multiple databases. This involved calls
get_app_upgrade_info()in signature deserialization (which didn't
know about databases) and the saving of
This updates all signature deserialization to support specifying a
database, and updates the model saving to use the evolver's assigned
Unit tests pass on all supported versions of Django.