Add installer app check in PM.deletePackage.

- Update PM.deletePackage to check if an app trying to delete a package
  is the same app that installed it.
- Update system apps to be orphans to allow silent deletion. This will
  make sure managed provisioning is not affected.

Fixes: 30280938
Change-Id: Ideab5a47eee2a00e7eefa9119112e37c3118783f