sbin: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

Remove $FreeBSD$: one-line .h pattern

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

Clean up global variable declarations in the dump and restore
utilities so that they will compile with -fno-common.

Started by: Kyle Evans (kevans)
Reviewed by: Kyle Evans (kevans)
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D24210

General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

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.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

Renumber copyright clause 4

Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by: Jan Schaumann <jschauma@stevens.edu>
Pull Request: https://github.com/freebsd/freebsd/pull/96

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.

Remove advertising clause from University of California Regent's license,
per letter dated July 22, 1999.

Approved by: core, imp

Move _PATH_WALL from dump and shutdown's local pathnames.h to paths.h.

SECURITY.

Notify operators using wall(1)'s -g option.
Drop ``setgid tty'' privilege.

Obtained from: OpenBSD
MFC after: 1 month

Move _PATH_DEFTAPE to <paths.h> to remove all the duplication of definitons,
and remove leading `r'(aw) from it.

Change rst0 into rsa0.

Backing out my change of /etc/rmt -> /usr/sbin/rmt.
Added comments in both files stateing why /etc/rmt is correct so someone
else wont do the same thing again.

Suggested by: Warner Losh & Ollivier

rmt is /usr/sbin/rmt, not /etc/rmt which is a link to /usr/sbin/rmt

Andreas Klemm's patch set for dump(8), with some minor (cosmetic)
changes and one addition by me.

. Use reasonable defaults for the tape drive (/dev/rst0) instead of
something we actually don't have.

. Add a summary line displaying the alapsed time and the total throughput.

. Replace "rmt" for the remote location of rmt(8) by "/etc/rmt", since this
is the historical protocol, and relying on the $PATH causes a big pain.
Make it adjustable via an environmental variable though.

Reviewed by: joerg (for Andreas' part)
Submitted by: andreas@knobel.gun.de (Andreas Klemm)

BSD 4.4 Lite sbin Sources

Note: XNSrouted and routed NOT imported here, they shall be imported with
usr.sbin.