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

- 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

Move is_wired_interface() from rc.d/wpa_supplicant into network.subr,
simplify it a bit, and make use of that method to determine if an
interface is a candidate for IPv6 rtsol rather than listing all of the
possible wireless interfaces that should _not_ get rtsol'ed.

This change is only relevant for 8.0+ unless the "wlan mandatory" code
gets ported back to RELENG_7.

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

rc support for vaps

o add rc.conf knobs to set the wpa_supplicant program, logging flags,
and config file
o change default logging options from -q to -s (log to syslog); this
is currently broken for boot-time startup as syslogd is started too
late but that'll be dealt with separately

MFC after: 2 weeks

add support wired interfaces

MFC after: 2 weeks

spell pidfile correctly so multiple wpa_supplicant processes can be run

MFC after: 1 week

wpa_supplicant(8) requires -D option for ndis(4) now.

Add support for starting wpa_supplicant by adding the WPA keyword to an
interface's ifconfig_<ifn> entry in /etc/rc.conf.

Approved by: re (network interface startup blanket)