Isolate app profile ref data

Due to aosp/1708274, ref data directory is now world accessible.
We need to fix ref data directory so that it does not leak app
visibility information.

Bug: 189787375
Test: AppDataIsolationTests
Merged-In: I8075d8b0e5af2d309dcc59f5dc6888ab56521c3c
Change-Id: I8075d8b0e5af2d309dcc59f5dc6888ab56521c3c
4 files changed