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.

Change-Id: Iacaba6d9d18d5337e65713960d14efe32006b330
Signed-off-by: rpcraig <rpcraig@tycho.ncsc.mil>