Add new domains for private apps.

/data/app-private is used when making an
app purchase or forward locking. Provide a
new label for the directory as well as the
tmp files that appear under it.

Change-Id: I910cd1aa63538253e10a8d80268212ad9fc9fca5
Signed-off-by: rpcraig <rpcraig@tycho.ncsc.mil>