selinux_getenforcemode
Reads the contents of the /etc/selinux/config file to determine how the
system was setup to run SELinux.
Sets the value of enforce to 1 if SELinux should be run in enforcing mode.
Sets the value of enforce to 0 if SELinux should be run in permissive mode.
Sets the value of enforce to -1 if SELinux should be disabled.
RETURN VALUE
On success, zero is returned.
On failure, -1 is returned.
