I've implemented the changes suggested here for the AoE driver for
2.6.9.  Here's a list of changes since December 6 when the 2.6.9 patch
was first submitted.  Suggestions made by more than one person are
only listed once.

Greg KH suggestions:
  * tell sysfs about our char drivers with class_simple
  * don't use typedefs
  * use list.h macros instead of our queue manipulation functions
  * get rid of our getfields function
  * remove stacked if statements (a Bell Labs-ism)
  * comment ioctl: device node permissions should be restrictive
  * return -ENOTTY for unsupported ioctls
  * return apropos errors instead of -1 in char device operations
  * remove aoeutils.c and use in-kernel functionality
  * move example scripts into Documentation/aoe

Jan-Benedict Glaw suggestions:
  * move Kconfig entry into parent dir
  * use NULL instead of nil
  * use ARRAY_SIZE instead of our nelems macro
  * remove unused device path macros
  * use C99 struct initializers
  * use __init and __exit more

Arjan van de Ven suggestions:
  * remove u.h
  * use mempool allocation in make_request_fn
  * use bdev->bd_openers instead of our own nopen

Pekka Enberg suggestions:
  * name our header aoe.h
  * only include needed headers each .c file
  * split one enum according to meaning
  * eliminate unnecessary casts from void * to typed pointer


Provide support for ATA over Ethernet devices

Signed-off-by: Ed L. Cashin <ecashin@coraid.com>