Use TapeAlert defined values instead of raw hex values

Signed-off-by: Mark Harvey <markh794@gmail.com>
Condense debug info in completeSCSICommand()

Condense two seperate log entries into one. Append sense info.

Signed-off-by: Mark Harvey <markh794@gmail.com>
Update register_ops to handle pre & post cmd handlers

Signed-off-by: Mark Harvey <markh794@gmail.com>