Purge more stray embedded $FreeBSD$ strings

These do not use __FBSDID but instead use bare char arrays.

Reviewed by: imp, emaste
Differential Revision: https://reviews.freebsd.org/D41957

spdx: The BSD-2-Clause-NetBSD identifier is obsolete, drop -NetBSD

The SPDX folks have obsoleted the BSD-2-Clause-NetBSD 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

rpc.sprayd: raise WARNS to 6

MFC after: 3 weeks

rpc.sprayd: Remove 3rd and 4th clauses in christos' license.

Obtained from: NetBSD

rpc.sprayd: Bring some changes from NetBSD.

Most notable, other than some style issues:
CVS 1.11:
do not use LOG_CONS.
CVS 1.13:
consistently use exit instead of return in main().
use LOG_WARNING instead of LOG_ERR for non critical errors.

Obtained from: NetBSD
MFC after: 2 weeks

libexec: 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 most cases where the address of an int is passed to a function expecting a
socklen_t * argument.

Port to TI/RPC and/or IPV6.

Submitted by: Jean-Luc Richier <Jean-Luc.Richier@imag.fr>

Spell void * as void * rather than caddr_t. This is complicated by the
fact that caddr_t is often misspelled as char *.

Sponsored by: DARPA, NAI Labs

o __P removal
o use new style prototypes and function definitions
o signal handlers need an argument. Mark it unused.

$Id$ -> $FreeBSD$

Do not terminate syslog() messages with a dot, as others daemons do.

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Obtained from: NetBSD
imported the rpc.sprayd from NetBSD - it is used by the new spray
command for network analysis