Leftovers of the SELinux policy update mechanism

Remove references to SELinux policy files in /data/security
from libselinux/android.c. In the process all code that is
apparently related to handling an alternate policy and/or
reloading the policy has been removed.

Set O_CLOEXEC mode flag on some open calls on policy files

Bug: 26544104
Change-Id: I573d325b2efaaa86716af64da7d626b23b8f8d89
3 files changed