SECURITY FIX: Fix package uids being reused between uninstall and rei…
…nstall of different packages.

Policies for older packages were being granted to the newly installed package that got the recyled uid.

Change-Id: I13e00ee5d2bfad8d11ce043536e9d2894b61a6cd
Merge remote-tracking branch 'github/jellybean' into dspa