fapolicyd for Debian

This is a simple application whitelisting daemon for Linux.

RUNTIME DEPENDENCIES
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* kernel >= 4.20 (Must support FANOTIFY_OPEN_EXEC_PERM. See [1] below.)

After configuring fapolicyd with /etc/fapolicyd/fapolicyd.conf and adding
the desired set of rules to /etc/fapolicyd/rules.d/ start the
fapolicyd service.
