Enable setting of font variable on console and constty

PR bin/59232

branches: 1.13.56;
Print 'Keyboard encoding -> sg' instead of just 'encoding -> sg' on the
console.

Provide yet more functionality to wscons.conf's "setvar" (see
examples in the wscons.conf). Now, you have to specify wscons
control device and put variable name and parameter on separate
fields.

NB: changes ARE NOT backward compatible and config file must be
checked (but default config doesn't utilizing setvar).

Add an extra argument to "setvar" to indicate whether a keyboard,
display or mouse variable should be changed. This is backwards compatible
with the old setvar style: if the argument is not specified, it defaults
to `keyboard'.

Add an _rc_subr_loaded variable, set to ":" by rc.subr. Scripts can use this
for a speedup by doing:
$_rc_subr_loaded . /etc/rc.subr

- Improve wscons.conf(5)
- Add support for "setvar", which allows setting of arbitrary wsconsctl(8)
variables. Per email on tech-userlevel from Julio Merino <jmmv@hispabsd.org>

Correct the "direction" of the barrier dependencies (DAEMON, LOGIN,
NETWORKING, and SERVERS) by specifying that certain things should
come BEFORE a given barrier, rather than having the barrier REQUIRE
a service. This allows scripts to be removed without having to
edit the barrier dependencies.

As discussed on tech-userlevel, and approved by Luke.

Add support for selection of a kernel builtin keymap and/or a userspace
keymap file to wscons.conf.
Follows PR misc/12760 by Stephen Borrill, but uses the external keymap
file instead of individual key entries in wscons.conf. This saves a lot
of editing work if the map has to be switched.

- only perform the checkyesno on the variable named in $rcvar (rather than
implicitly using $name if $rcvar isn't set), and always perform this check,
even when using start_cmd (et al).
this check is performed before the pidcmd
is run, speeding up scripts that weren't going to be run anyway.
this should speed up booting slow systems.

- take advantage of the above and remove
start_precmd="checkyesno foo"
in scripts that use start_cmd.

- explicitly set rcvar=foo in the rc.d/foo scripts which have an equivalent
rc.conf entry

- fix `rcvar' and `restart' when $rcvar isn't set.
these above changes fix PR [bin/11027].

- when doing `force*', ignore the return value of *_precmd.
this fixes PR [bin/10781].

- rename what sysdb provides from `databases' to `sysdb', to reflect
the name of the script.

- improve the comments in rc.subr

migrate rc.wscons to (already existing) rc.d/wscons

* add new dummy dependancy `NETWORK' to be REQUIREd by services which need
networking to be operational before starting, and use as appropriate.
NETWORK depends upon network and dhclient.
* move the guts of systemfs into mountcritlocal
* replace the dependancy on systemfs with mountcritremote, and remove the
former.
* SERVERS now also depends upon ppp

Notes:
* dhclient (and others) needs /var to be a $critical_filesystem_beforenet
* dhclient now starts before syslogd (because the latter needs /usr, and
/usr might need dhclient to be mounted)

Should fix PRs:
[install/9853] [bin/10002] [misc/10349] [port-i386/10633] [misc/10641]

branches: 1.3.4;
Use load_rc_config() (from rc.subr) instead of sourcing /etc/rc.conf.
This allows us or a user to change the configuration file method in
one place - rc.subr - without having to edit all of the rc.d/* files.

Don't start rc.wscons with an start/stop argument. Disable stop and add an
checkyesno check.

branches: 1.1.1;
Initial revision