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

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

MFC r229930

Add setsockopt(2) example to ng_ksocket(4).
While here, fix formatting a bit

Approved by: ae(mentor)

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

Approved by: re (implicit)

Reference socket(9) from ng_ksocket(4). Reference ng_ksocket(4),
ithread(9), msleep(9), ucred(9) from socket(9).

Partly suggested by: julian

Belatedly document the NGM_KSOCKET_ACCEPT ("accept") control message.

Verify that SYNOPSIS section compiles.

Mechanically kill hard sentence breaks and double whitespaces.

Convert Netgraph to use mbuf tags to pass its meta information around.
Thanks to Sam for importing tags in a way that allowed this to be done.

Submitted by: Gleb Smirnoff <glebius@cell.sick.ru>
Also allow the sr and ar drivers to create netgraph versions of their modules.
Document the change to the ksocket node.

Hiten's patchset for section four manpages, slightly edited by me.

Ispell sweep of share/man/man4.

mdoc(7) police: Use the new .In macro for #include statements.

mdoc(7) police: s/BSD/.Bx/ where appropriate.

Removed whitespace at end-of-line; no content changes. I simply did
cd src/share; find man[1-9] -type f|xargs perl -pi -e 's/[ \t]+$//'

BTW, what editors are the culprits? I'm using vim and it shows
me whitespace at EOL in troff files with a thick blue block...

Reviewed by: Silence from cvs diff -b
MFC after: 7 days

mdoc(7) police: removed HISTORY info from the .Os call.

mdoc(7) police: remove extraneous .Pp before and/or after .Sh.

Fix cross-references:
xntpd.8 --> ntpd.8
acl_delete_perms.3 --> acl_delete_perm.3
getname.2 --> getsockname.2

MFC after: 1 week

Eliminate mdocNG warnings caused by misplaced or extraneous macro calls.

Update @freebsd.org email addresses to @FreeBSD.org as is the
precedent.

Change archie's and my email addresses from Whistle.com to FreeBSD.org

Move netgraph node type man pages from section 8 to section 4.

Fix typo.

Reported by: Robert Swindells <swindellsr@genrad.co.uk>

Work around aparent bug in the .Dv macro by eliminating some spaces.
The closing curly-brace in this line was being omitted somehow.

Manual page style work.
Submitted by: Alexey Zelkin <phantom@FreeBSD.org>
thanks!

Update documentation to reflect new functionality.

New Netgraph node type "ksocket".

Obtained from: Whistle source tree