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

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

Add const qualifier to the dst parameter of the ifnet if_output method.

This driver has two modes, a netgraph mode and an ifnet mode. In the
netgraph mode it used a private timer to drive the transmit watchdog. In
the ifnet mode it used if_watchdog. Now it always uses the private timer.

Unbreak build.

Pointy hat to: attilio

Change if_output to take a struct route as its fourth argument in order
to allow passing a cached struct llentry * down to L2

Reviewed by: rwatson

shutdown returns an int

Rename several functions in if_lmc with potential name collisions with
global symbols, such as raw_input and raw_output, to have lmc_ prefixes.
This doesn't affect actual functionality since the functions are static,
but will limit the opportunities for current confusion and future
difficulty.

MFC after: 3 days

Sweep kernel replacing suser(9) calls with priv(9) calls, assigning
specific privilege names to a broad range of privileges. These may
require some future tweaking.

Sponsored by: nCircle Network Security, Inc.
Obtained from: TrustedBSD Project
Discussed on: arch@
Reviewed (at least in part) by: mlaier, jmg, pjd, bde, ceri,
Alex Lyashkov <umka at sevcity dot net>,
Skip Ford <skip dot ford at verizon dot net>,
Antoine Brodin <antoine dot brodin at laposte dot net>

The contents pointed by ssi_cables[] is never changed so explicitly
declare it as const char * instead of char *.

This change have no side impact to the code itself, and is a step
forward to WARNS=6 truss(1).

add missed calls to bpf_peers_present

Fix -Wundef warnings found when compiling i386 LINT, GENERIC and
custom kernels.

Reintroduce the lmc T1/E1/T3 WAN driver. This version is locked, supports
interface polling, compiles on 64-bit platforms, and compiles on NetBSD,
OpenBSD, BSD/OS, and Linux. Woo! Thanks to David Boggs for providing this
driver.

Altq, sppp, netgraph, and bpf are required for this driver to operate.
Userland tools and man pages will be committed next.

Submitted by: David Boggs