Proper security labeling of multi-user data directories.

This patch covers 2 cases. When an app is installed
and the resulting data directory is created for all
existing users. And when a new user is created and
all existing app data directories are created for
the new user.

Signed-off-by: rpcraig <rpcraig@tycho.ncsc.mil>

Change-Id: I01f2a9084dfe7886087b1497070b0d7f2ad8478e
Update location of policy files

The location of policy files has changed from
/data/system to /data/security.

Also, a name change to mmac enforcing property
name to place it under persist.mmac. namesepace.

Adds api's for getting and setting the MMAC
enforcing mode.

Change-Id: I0e9468fe651cd6ec018d5c85d35d693e55479e89
Change DPMS code to accommodate enforce states on boot.

We need to respect if setenforce (selinux enforce), setsebool (booleans),
or setprop (mmac enforce) are set in the any of the init.rc files.
This set of changes will allow the init.rc values to win over any
potential device admin wishes.

Change-Id: I01f2a9084dfe7886087b1497070b0d7f2ad8473e
Signed-off-by: Robert Craig <rpcraig@tycho.ncsc.mil>