Validate package names passed to the installer. am: d42af9a5

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



Change-Id: I17926f1e56a9a2d2eeb66055c9c7a05131590dd4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>