Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

The last big commit: let usr.sbin/ use WARNS=6 by default.

Enable building of OpenBSM command line tools:

- audit(8) - audit subsystem management tool
- auditd(8) - audit trail and subsystem management daemon
- auditreduce(1) - audit trail reduction tool
- praudit(1) - audit trail printing tool

Could probably use a NO_AUDIT make.conf flag.

Obtained from: TrustedBSD Project