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 am: 0e29adfc

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



Change-Id: I061f8ae2710dbcd79bd9a67d0f2a4e50079b97ab
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>