lib: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by: Netflix

Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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

lib: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified 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.

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.

Restore the previous state after a FILL operation in properties_read()
rather than forcing the state to LOOK. If we are in the middle of parsing
a line when we have to do a FILL we would have lost any token we were in
the middle of parsing and would have treated the next character as being
at the start of a new line instead.

PR: kern/89181
Submitted by: Antony Mawer gnats at mawer dot org
MFC after: 1 week

Tidy up. Sort headers.

Now return NULLified struct in case of empty config file
(previous variant return NULL pointer for both empty file case and error case,
so caller can't sense error properly).

It not affect existen programs because property_find() now returns NULL
for both NULL pointer and NULLified struct.

Handle read errors

Add (unsigned char) cast to ctype macros
Handle NULL return from malloc and strdup

Replace various spelling with FALLTHROUGH which is lint()able

Add __FBSDID()s to libutil

Eliminate inconsistency where a value that contains only whitespace
confuses the parser.

Approved by: jkh

Added PROPERTY_MAX_VALUE and PROPERTY_MAX_NAME defines to libutil.h so
that applications know how large of a buffer they must allocate before
calling property_find(). Also added a $FreeBSD$ tag while I'm here.

Approved by: jkh

Better document the file format, add in support for nested {}'s in multi-line
property values.

Now take stdio.h out of files that don't require it.

o move path in libutil.h to paths.h
o make property_read() take a fd instead to avoid stdio.h mess
o update auth to new interface.

Correct a build error that got past my build test somehow.

Add a simple mechanism for reading property lists from files (which
I'll convert sysinstall to use shortly) and a simple call which uses
this mechanism to implement an /etc/auth.conf file. I'll let Mark Murray
handle the format and checkin of the sample auth.conf file.
Reviewed by: markm