o Introduce /var/log/authentication.log, which will be the target for
auth.info and authpriv.info by default. Rotate on the same schedule
as most other logs. Create at installation.
o Remove logging of auth.info from /var/log/security.log, which will
return to being only for security feature subsystems (such as ipfw,
and so on).
This creates a special authentication log, which can now be searched
by scripts for authentication events.