Merge "Add test method UserLifecycleStressTest.switchToExistingGuestAndStartOverStressTest" into tm-dev am: e1062bc7 am: 52783a4d am: 107289a9 am: b0625011

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17749723



Change-Id: Ia8e0792b9ae3ad0a1ac8e12d4fb74961b029da3e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>