Add two new functions to the libusb20 API and required kernel ioctls.

- libusb20_dev_get_iface_desc
- libusb20_dev_get_info

New command to usbconfig, "show_ifdrv", which will print out the kernel driver
attached to the given USB device aswell.

See "man libusb20" for a detailed description.

Some minor style corrections long-line wrapping.

Submitted by:	Hans Petter Selasky

1. Move most of the ifnet logic into the usb2_ethernet module, this includes,
 - make all usb ethernet interfaces named ue%d
 - handle all threading in usb2_ethernet
 - provide default ioctl handler
 - handle mbuf rx
 - provide locked callbacks for init,start,stop,etc

2. Cleanup CDC-Ethernet driver.

Submitted by:	Hans Petter Selasky
Obtained from:	svn.freebsd.org/base/user/thompsa/usb [1]

to be able to look them up.

src/usr.bin/usbhidctl/usbhid.c
src/sys/dev/usb2/include/usb2_hid.h
src/sys/dev/usb2/input/uhid2.c
src/lib/libusbhid/Makefile
src/lib/libusbhid/descr.c
src/lib/libusbhid/descr_compat.c
src/lib/libusbhid/usbhid.3
src/lib/libusbhid/usbhid.h
src/lib/libusbhid/usbvar.h

Patches to make libusbhid and HID userland utilities compatible with
the new USB stack. All HID ioctls should go through the libusbhid
library to ensure compatibility. I have found at least one piece of
software in /usr/ports which needs to get updated before USB HID
devices will work. This is the X joystick input driver.

Reported and tested by:

Daichi GOTO and Masanori OZAWA.

src/sys/dev/usb2/core/usb2_process.c

Correct USB process names.

Reported by:

Andre Guibert de Bruet

src/sys/dev/usb2/serial/uftdi2.c

Integrate changes from old USB stack.

Submitted by:	hps