Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

various: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

- Import the HEAD csup code which is the basis for the cvsmode work.

Fix some warnings by making things const, adding missing headers,
removing some unused variables and making a variable unsigned.

MFC after: 3 weeks

Teach login(1) about the make.conf NO_AUDIT variable. This allows us to
conditionally build in audit support.

Submitted by: bz
MFC after: 1 week

Make login audit-enabled, submitting audit records for the login and logout
events. The specifics of submitting the records is contained within
login_audit.c.
Document the auditing behavior in the man page.

Obtained from: TrustedBSD Project, Apple Computer, Inc.
Approved by: rwatson (mentor)

remove __P

Still with asbestos longjohns on, completely PAMify login(1) and remove
code made redundant by various PAM modules (primarily pam_unix(8)).

Sponsored by: DARPA, NAI Labs

Style fixups.

Sort function declarations, includes. Make consistent WRT use of _P()
macro (ugh!)

Inspired by: bde

WARNS=2 fixes.

Reviewed by: bde (a while back)