PR/47584: Steffen Daoden: Add option to turn off Nagle to rlogin

branches: 1.25.44; 1.25.50;
Remove the -L parameter from the first line of the SYNOPSIS
and bump the date.

ok Hubert Feyrer.

Bump date for new -4, -6.

Support -4 and -6. Approved by christos.

Dead code clean up:
* The function speed(), imported from 4.4BSD-Lite2, has never been
used by NetBSD. Obtained from FreeBSD.
* Finish removing -L (litout) option. This has not been supported
since rev. 1.5 (NetBSD 1.0). The option still appeared in the
usage and man page. Obtained from FreeBSD.
* In function doit(), dead code imported from 4.4BSD-Lite2, dealing
with termios. NetBSD cracked this nut differently long before this
import. Obtained from FreeBSD.

Bump date for removal of Kerberos option descriptions.
Remove dots at end of SEE ALSO.

Kerberos support is broken in rcommands, thus making -K -k and -x options
unavailable. Remove theses options from the man pages (it won't be very
hard to bring them back if we fix kerberos one day)

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22365, verified by myself.

Use Aq or Ao/Ac instead of \*[Lt]/\*[Gt].

* Document $RCMD_CMD in environ(7).
* Cross-reference rcmd(1), rcmd(3), and environ(7) as appropriate.

Should fix [bin/21670] from Geoff Wing.

Use more mdoc macros. Some mdoc fixes.
Remove the following sentence from the BUGS section:
rlogin will be replaced by telnet(1) in the near future.

Add -p option to rsh and rlogin to allow specifying a non-standard port
number.

.Nm does not need a dummy argument ("") before punctuation or
for correct formatting of the SYNOPSIS any longer.

"Utilize" has exactly the same meaning as "use," but it is more
difficult to read and understand. Most manuals of English style
therefore say that you should use "use".

Generate <>& symbolically. I'm avoiding .../dist/... directories for now.

Sort SEE ALSO.

kerberos(3) -> (8).

branches: 1.9.10;
More and more .Os cleanups. .Os is defined in the tmac.doc-common file,
so we shouldn't override it with versions in the manpages. Many more to
come.

Add xrefs to new hosts.equiv(5)/rhosts(5) man page.

branches: 1.7.2;
WARNSify, fix .Nm usage, deprecate register, getopt returns -1 not EOF

Sync to 4.4BSD-Lite2

Document the -l option.
From Dave Huang <khym@bga.com>, PR #2601.

`.FL' -> `.Fl' (from Masanobu Saitoh; PR#1378).

clean up import.

Add RCS indentifiers.

branches: 1.1.1;
Initial revision