usr.bin: 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 sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

Add HAS_TESTS to all Makefiles that are currently using the
`SUBDIR.${MK_TESTS}+= tests` idiom.

This is a follow up to r321912.

Convert traditional ${MK_TESTS} conditional idiom for including test
directories to SUBDIR.${MK_TESTS} idiom

This is being done to pave the way for future work (and homogenity) in
^/projects/make-check-sandbox .

No functional change intended.

MFC after: 1 weeks

Integrate indent tests added in r313544 into ATF/Kyua and the FreeBSD
test suite

This change does the following:

- Introduces symmetry in the test inputs/outputs by adding the exit
code to the files. This simplified the test driver notably by
requiring less filename/test name manipulation.
- Adds a test driver for the testcases added in r313544, patterned
after bin/sh/tests/functional_test.sh . The driver calls indent as
noted in r313544, with an exception: The $FreeBSD$ RCS keyword's
expansion is reindented with indent, which means that the output
differs from the expected output. Thus, all lines with $FreeBSD$
in them are deleted on the fly, both in the input file and the
output file.

The test inputs/outputs are copied to the kyua sandbox before the
test is run as the pathing in some of the files relies on pathing
normalized to the current directory (copying the files is the
easiest way to resolve the issue).

Approved by: pstef (maintainer)
Reviewed by: pstef
X-MFC with: r313544
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D9682

Add the Clang specific -Wmissing-variable-declarations to WARNS=6.

This compiler flag enforces that that people either mark variables
static or use an external declarations for the variable, similar to how
-Wmissing-prototypes works for functions.

Due to the fact that Yacc/Lex generate code that cannot trivially be
changed to not warn because of this (lots of yy* variables), add a
NO_WMISSING_VARIABLE_DECLARATIONS that can be used to turn off this
specific compiler warning.

Announced on: toolchain@

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.

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