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

Initial Bluetooth LE support.

Note that sockaddr_l2cap structure is changed , check socket address
to initialize new structure member and define L2CAP_SOCKET_CHECKED
before including ng_btsocket.h

Differential Revision: https://reviews.freebsd.org/D2021
Reviewed by:emax

/* -> /*- for license, minor formatting changes

Fix kernel build (caused by recent ng_{un}timeout API change)

Submitted by: glebius

Make sure Bluetooth stuff can be compiled on amd64

Submitted by: ps

Change double include protection style in headers to match
the rest of Netgraph code.

Reviewed by: imp, ru
Approved by: imp (mentor)

Part one of undating the bluetooth code to the newest version

Submitted by: Maksim Yevmenkin <m_evmenkin@yahoo.com>
Approved by: re@

The second try a committing the bluetooth code
Has been seen to work on several cards and communicating with
several mobile phones to use them as modems etc.

We are still talking with 3com to try get them to allow us to include
the firmware for their pccard in the driver but the driver is here..
In the mean time
it can be downloaded from the 3com website and loaded using the utility
bt3cfw(8) (supplied) (instructions in the man page)

Not yet linked to the build

Submitted by: Maksim Yevmenkin <myevmenk@exodus.net>
Approved by: re