MidLayer updates

The following 3 patches extend the scsi midlayer. Changes were prompted
by recent discussions with Christoph as part of the Emulex driver thread.

Patch 1: 
  Updates the recent transport container patch for :
  - allow device driver-specific attributes to be added to class objects
  - exposes classdev to transport via setup function

Patch 2: 
  Adds io statistics (requests, completions, error count) as generic
  attributes for scsi devices.

Patch 3: 
  This patch extends scsi_target support:
  - Allows for driver-specific data to be allocated along with the
    target structure and accessible via the starget->hostdata pointer.
  - Adds scsi target alloc/configure/destory callbacks to the
    scsi host template.
  - Rearranges the calling sequences for scsi targets so that the
    target and slave alloc/configure/destory callbacks are in
    order (target before slave on alloc/configure).

Although bad form, as there's so much churn in this area, the following
dependencies exist:
- Patches were created against scsi-rc-fixes-2.6 bitkeeper tree.
- Patch 1 depends on Mike Christies patch 
  http://marc.theaimsgroup.com/?l=linux-scsi&m=11067893...


-- James S
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