Remove $FreeBSD$: one-line sh pattern

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Fix the build of tools/regression/sockets/unix_cmsg

MFC after: 2 weeks

Add a new socket option SO_TS_CLOCK to pick from several different clock
sources to return timestamps when SO_TIMESTAMP is enabled. Two additional
clock sources are:

o nanosecond resolution realtime clock (equivalent of CLOCK_REALTIME);
o nanosecond resolution monotonic clock (equivalent of CLOCK_MONOTONIC).

In addition to this, this option provides unified interface to get bintime
(equivalent of using SO_BINTIME), except it also supported with IPv6 where
SO_BINTIME has never been supported. The long term plan is to depreciate
SO_BINTIME and move everything to using SO_TS_CLOCK.

Idea for this enhancement has been briefly discussed on the Net session
during dev summit in Ottawa last June and the general input was positive.

This change is believed to benefit network benchmarks/profiling as well
as other scenarios where precise time of arrival measurement is necessary.

There are two regression test cases as part of this commit: one extends unix
domain test code (unix_cmsg) to test new SCM_XXX types and another one
implementis totally new test case which exchanges UDP packets between two
processes using both conventional methods (i.e. calling clock_gettime(2)
before recv(2) and after send(2)), as well as using setsockopt()+recv() in
receive path. The resulting delays are checked for sanity for all supported
clock types.

Reviewed by: adrian, gnn
Differential Revision: https://reviews.freebsd.org/D9171

Check that SCM_XXX timestamp returned by the kernel is less 1 second
away in the past from the current time. This should be plenty for the
scheduler to do its job. It provides assurance that the timestamp
returned is actually a valid one, not just some random garbage.

Auto-generate 2 test cases that differ only in structure and SCM_XXX constant
used. We can do it programmatically, but that would make code convoluted
and more complex. I have two more of those types coming for the CLOCK_REALTIME
and CLOCK_MONOTONIC. This seems like an elegant and scallable approach.

Refactor the regression test code by splitting huge monolithic C
file into smaller pieces that are hopefully easier to understand
and extend. This is to pave the ground for adding few more
socket timestamp formats that I am working on here.

No functional changes (I hope).

NO_MAN= has been deprecated in favor of MAN= for some time, go ahead
and finish the job. ncurses is now the only Makefile in the tree that
uses it since it wasn't a simple mechanical change, and will be
addressed in a future commit.

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.

o Add a collection of regression tests for ancillary (control)
data passing for unix domain sockets, stream and datagram.

There are 15 tests:

Test/Type of socket STREAM DGRAM
----------------------------------------------------------------------
Sending, receiving cmsgcred 1 6
Receiving sockcred (listening socket has LOCAL_CREDS) 2 n/a
Receiving sockcred (accepted socket has LOCAL_CREDS) 3 n/a
Receiving sockcred n/a 7
Sending cmsgcred, receiving sockcred 4 8
Sending, receiving timestamp 5 9
Sending, receiving cmsgcred (no control data) 10 13
Sending cmsgcred, receiving sockcred (no control data) 11 14
Sending, receiving timestamp (no control data) 12 15

Currently we pass 8 tests. All the rest marked as TODO.

PR: kern/90800
Submitted by: Andrey Simonenko