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Require app_data_file access to be explicitly allowed to
each domain.  We especially do not want to allow
app_data_file:lnk_file read to any privileged domain.
But removing app_data_file access in general can be useful
in protecting app data from rogue daemons.

Change-Id: I46240562bce76579e108495ab15833e143841ad8
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>