Update DatabaseLoader querying.

Change the way the queries are built and sorted for the
database loader. It now constructs 3 queries that match
different columns. Each query returns their results
and gets sorted, then merged into the master list of
results.

Change-Id: Id643422ddfe26bfec89e04ee9f5832b99148e22a
Test: make RunSettingsRoboTests
Bug: 32904057, 32903623