CTS tests for non-system locales and matching pseduolocales

This adds test for matching pseudolocales (they are not considering
matching the language itself, just the literal pseudolocale), and the
new getNonSystemLocales() method in AssetManager.

Bug: 25800576
Bug: 26236938
Change-Id: Ie1bd63763b0b320fa30a7206fcb3d662f39f07b6
2 files changed