Validate package names passed to the installer. am: 0182732e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/25676147



Change-Id: I019700758d93bde83d180b86c1c532b331986df5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>