Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

Make FILESYSTEMS, dumpon, and var not depend on zfs and zvol

Make zfs and zvol come before all of the items that depended on them
previously

MFC after: 2 weeks
Sponsored by: EMC / Isilon Storage Division

- Add descriptions to most of the rc scripts. Those are mostly taken from their
daemon's manpage and probably improved.
- Consistently use "filesystem" not "file system".

Approved by: bapt, brueffer
Differential Revision: D452

This change does the following for the scripts that run up through
FILESYSTEMS (the default early_late_divider):
1. Move sysctl to run first
2. Move as many BEFOREs to REQUIREs as possible.
3. Minor effect, move hostid_save from right before mdconfig to right
after.

A lot of the early scripts make use of sysctl one way or another so
running this first makes a lot of sense given that system-critical
values are often placed in sysctl.conf.

My original purpose for working on this was that while doing some
debugging on other stuff I noticed that the order of execution was
different in the first pass through the early scripts and the second.
In practice that doesn't matter because the scripts are not executed the
second time. However this _can_ result in problems if the difference in
the rcorder moves a script from the late section to the early section in
the second pass (which would mean the script would not get executed).
So, I wanted to make the order of execution of the scripts in the early
section more deterministic.

In the course of debugging the ordering problems I noticed that moving
the BEFOREs to REQUIREs prevented the changes in order from the first
pass to the second pass without having to make any substantial changes.
(Of course it's no secret that I think BEFORE should be avoided as much
as possible, but this is a good example of why.)

Reviewed by: silence on freebsd-rc@
MFC after: 8.1-RELEASE

As previously discussed, add the svn:executable property to all scripts

Remove the -v flag from the command line to dumpon(8), and instead print
diagnostic ouput only if the command fails.

Remove rcconf.sh from /etc/rc.d, and instead load the configuration
as part of rc. Doing this, and the sourcing of rc.subr after we have
determined if we are booting diskless (and correspondingly run
rc.initdiskless if necessary) are safe, and actually allow fewer files
to be needed on the diskless box. This also allows variables from
the configuration to be available to rc itself, such as ...

Add a variable to rc.conf, early_late_divider, which designates the
script which separates the early and late stages of the boot process.
Default this to mountcritlocal, and add text to etc/defaults/rc.conf,
rc.conf(5) and diskless(8) which describes how and why one might want
to change this.

Reviewed by: brooks

Use kenv -q to extract dumpdev rather than kenv, in order to avoid
spamming the console in the event that a loader tunable 'dumpdev'
isn't defined, which is not a relevant failure to report.

MFC after: 1 week

Honor the "dumpdev" kenv variable if it is set and the "dumpdev" rc
variable is set to "AUTO".

MFC after: 2 weeks

'dumpon' can run before 'initrandom' so make it.
This gives a better chance of debugging /dev/random related panics.

When dumpdev is set to 'auto', and a suitable swap device is found,
create a symbolic link /dev/dumpdev designating that device so
savecore can find and save a previous kernel dump.

Remove unused computation of memory size.

Reviewed by: des

Remove the requirement for the FreeBSD keyword as it no longer
makes any sense.

Discussed with: dougb, brooks
MFC after: 3 days

If $dumpdev is set to AUTO, use the first suitable swap partition listed
in /etc/fstab, or print an error message if no suitable device was found.

MFC after: 4 weeks

Mark scripts as not usable inside a jail by adding keyword 'nojail'.

Some suggestions from: rwatson, Ruben de Groot <mail25@bzerk.org>

Teach /etc/rc.d/dumpon script how to stop.

Reviewed by: gordon
Approved by: gordon, scottl (mentor)

Merge in all the changes that Mike Makonnen has been maintaining for a
while. This is only the script pieces, the glue for the build comes next.

Submitted by: Mike Makonnen <makonnen@pacbell.net>
Reviewed by: silence on -current and -hackers
Prodded by: rwatson