Extend tests to try loading private libs through product and vendor am: 86224fd876 am: 1e13ab0fb0 am: 81feef29f4 am: 17a1000442

Original change: https://android-review.googlesource.com/c/platform/art/+/2239933

Change-Id: Iae3cd820a761c214913a2f6cefa662fc545d4d19
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>