Add security/setaudit: Tool to specify audit configurations on a process

With setaudit it is possible to specify audit configurations on a process
directly at the runtime.

All audit events are redirected to the auditd(8), an audit log management
daemon.

Example of enabling all exe related audit events performed by a command and its
child processes:

1. setaudit -m ex command

WWW: https://github.com/csjayp/setaudit

PR: 226627
Submitted by: Mateusz Piotrowski <0mp@FreeBSD.org>