TaskManagement: Store the ITT and CMDSN in the scsi_task structure

These are required for some of the task management functions

include/scsi-lowlevel.h

@@ -126,6 +126,9 @@ struct scsi_task {
 	struct scsi_allocated_memory *mem;
 
 	void *ptr;
+
+	uint32_t itt;
+	uint32_t cmdsn;
 };
 
 void scsi_free_scsi_task(struct scsi_task *task);