Only system can set application restrictions via UserManager

Preventing apps with MANAGE_USERS from managing application
restrictions via UserManager. Application restrictions should
only be set via DevicePolicyManager.setApplicationRestrictions,
or via Settings (for restricted profiles).

Bug: 22541936
Change-Id: Ieed51ef54b4c23a73f383465e9af9b3bcf18a514
3 files changed