Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Simply things so that "#REQUIRE: FILESYSTEMS" means the file
systems are fully "ready to go".

'FILESYSTEMS' states: "This is a dummy dependency, for services which
require file systems to be mounted before starting." However, we have
'var' which is was run after 'FILESYSTEMS' and can mount /var if it
already isn't mounted. Furthermore, several scripts cannot use /var
until 'cleanvar' has done its thing. Thus "FILESYSTEMS" hasn't really
meant all critical file systems are fully usable.

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

Introduce mixer_enable (default: YES).

PR: conf/101268
Submitted by: Eugene Grosbein <eugen@grosbein.pp.ru>
Approved by: cperciva (mentor)
X-MFC after: 6.2-RELEASE
Sponsored by: FreeBSD Test-Bugathon

Use of REQUIRE is better than BEFORE for most scripts, and very
few scripts should have no REQUIRE at all.

Remove the 'usbd' keyword (it isn't necessary for mixer). Also, use
BEFORE instead of REQUIRE.

Probably ok by: jhb
MFC after: 3 days

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

Discussed with: dougb, brooks
MFC after: 3 days

A few small cleanups:

1. Add the shutdown keyword so that the script is run at shutdown time,
and the mixer* files are saved.
2. Twiddle whitespace.
3. Remove an unecessary function, and therefore collapse one variable.

Added 'nojail' keyword for rc.d/mixer script, while mixer(8) is not
usable in jail by default (no /dev/mixer).

Add a mixer script that saves the current settings of all mixers present
in the system on shutdown and restores the settings on boot. The settings
can also be reset to the saved values via 'mixer reload'.

Reviewed by: current@