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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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

Introduce another global (MPPE_IsServer) so that we initiate the
MPPE session keys correctly.

I'm a bit dubious about this code. It seems that the session keys
are initialised differently based on whether you're the client or
the server. One side is the server if it issues the first challenge,
but of course you can issue a challenge from both sides.... at the
same time. Sounds like another wonderful M$ assumption...

Ppp can now talk to itself correctly using encryption.

Problem solved by: Ustimenko Semen <semen@iclub.nsu.ru>
Hair torn out by: me

Add MPPE and MSChap v2 support (denied and disabled by default)

Submitted by: Ustimenko Semen <semen@iclub.nsu.ru>