Merge "Don't allow users to be switched on keyguard when multiple users is...

Merge "Don't allow users to be switched on keyguard when multiple users is disabled" into udc-dev am: aa792b8d am: 74f3f4a0 am: 91ee781d am: 7ceda92b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23620497



Change-Id: I752abd31254976d9198687d4ed67bdd135bdc360
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>