ide-scsi changes for new mid level api and error handling in 2.5.52

ide-scsi changes for new mid level api and error handling in 2.5.52

Here is my proposal for bringing ide-scsi in line with the current kernel.

The attached patch does:

1. Change from old style initialization to the new hotplug initialization model.
   It involves declaring both a parent device and bus kernel object, which feels
   a bit awkward, but hey, it works.

2. Make ide-scsi request sense itself when CHECK_CONDITION is asserted. This
   change particularly makes ide-scsi run much smoother on my test box.

3. Implement eh_abort_handler and eh_device_reset_handler. I have no real way
   to thoroughly test these new routines, so for this part particularly I ask
   for peer review.