Validate package names passed to the installer. am: d42af9a5 am: dd8a33e1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/25648374



Change-Id: I5c3504d4e043e0a880e78ac325c9f67a3158c06c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>