Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

mtest(8): use correct macro in mdoc

The An macros is used for authors while the Ar macro is used for arguments.
AFAIK mcast-addr and ifname are not authors.

PR: docs/184649

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

mdoc: make pages render with mandoc

It's a bit more pedantic regarding .Bl list elements. This has an added
benefit of unbreaking the ipfw(8) manpage, where groff was silently
skipping one list element.

mdoc: order prologue macros consistently by Dd/Dt/Os

Although groff_mdoc(7) gives another impression, this is the ordering
most widely used and also required by mdocml/mandoc.

Reviewed by: ru
Approved by: philip, ed (mentors)

Merge IPv6-capable mtest(8) from MLDv2 branch.

Update mtest(8) manual page.

Merge a slightly cleaner and SSM capable mtest(8).

Submitted by: Wilbert De Graaf
MFC after: 1 month

Mechanically kill hard sentence breaks.

The .Nm utility

Prepare for mdoc(7)NG.

$Id$ -> $FreeBSD$

Add $Id$, to make it simpler for members of the translation teams to
track.

The Id line is normally at the bottom of the main comment block in the
man page, separated from the rest of the manpage by an empty comment,
like so;

.\" $Id$
.\"

If the immediately preceding comment is a @(#) format ID marker than the
the $Id$ will line up underneath it with no intervening blank lines.
Otherwise, an additional blank line is inserted.

Approved by: bde

Use err(3). -Wall cleaning.

Add the one line description of the man page at the top so
that "whatis" will report something more than just "mtest".

Make mtest build. Write a makefile and a man page.