Show specific messages for why bouncer is shown before or after OTA update....

Show specific messages for why bouncer is shown before or after OTA update. am: eacf34bc am: 628817b8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23677919



Change-Id: I59fbece4b73cb1783caba197d59d729ddc7812a4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>