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

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



Change-Id: I5327ae98dfc76b3872630881702ccf7b3bd106da
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>