PackageManagerTest: match FACTORY_ONLY apex

* It should be fine in PackageManagerTest to only care about
  pre-installed shim apex.
* Scenarios using updated shim apex are covered in StagedInstallTest.
* This makes PackageManagerTest robust against other tests failing to
  clean up state properly.

Test: install v2 of shim apex and run atest PackageManagerTest
Change-Id: If5b08abf75d8843b2033c194328c1fb204b00325
1 file changed