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

Validate package names passed to the installer. am: d42af9a5 am: dd8a33e1 am: f7b47c51 am: bde2b3ca

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



Change-Id: I71f3ecb214d4ed82af5b9996018e79d07d0d8c49
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>