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

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

Remove bridge(4) from the tree. if_bridge(4) is a full functional
replacement and has additional features which make it superior.

Discussed on: -arch
Reviewed by: thompsa
X-MFC-after: never (RELENG_6 as transition period)

Remove miidevs.h and generate it from miidevs at compile time.
The devlist2h.awk tool to do this has been repocopied to sys/tools/.

Move tx(4) driver to sys/dev/tx. BTW split hardware structures and constants
into if_txreg.h.

MFC after: 1 week

Update tx(4) to always enable vlan(4) support.

Approved by: semenu

Add support for 802.1Q VLAN and oversized ethernet frames.

PR: kern/29235
Submitted by: Peter Jeremy <peter.jeremy@alcatel.com.au>
Reviewed by: Yar Tikhiy <yar@FreeBSD.org>
MFC after: 1 week

Use a consistent style and one much closer to the rest of /usr/src

Use .include <bsd.kmod.mk> to get to ../../*/conf/kmod.mk instead of
encoding the relative path.

Pull in sys/conf/kmod.mk, rather than /usr/share/mk/bsd.kmod.mk.
This means that the kernel can be totally self contained now and is not
dependent on the last buildworld to update /usr/share/mk. This might
also make it easier to build 5.x kernels on 4.0 boxes etc, assuming
gensetdefs and config(8) are updated.

Zap KMODDEPS line

Premier version of Makefile to build tx driver as KLD