* add scsi_target_block() and scsi_target_unblock() routines which
  take a generic-device.  Side note:  there are mixture of
  scsi_<object>_<action>() and scsi_<action>_<noun>() functions defined
  in the scsi APIs -- going forward are there any 'guides' or
  suggestions on which to choose?
* modify scsi_remove_target() to take a generic-device.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>