Ensure per package and per UID state share same package settings.

When renaming a package during an OTA we were getting in a state
where the package setting mapped to the package UID was not the
same instance as the one we create for the new package mapped.
This leads to a drift between the permissions state for the package
and that state for the UID, resulting in broken for UID permission
checks as granted permissions were never appearing in the per UID
package setting.

bug:22928831

Change-Id: Ib0372632ec84a917304561fd94032cd09bb4c12f