This patch series is the first batch of cleanups in an attempt to make
the SCSI printing more consistent and suitable for human consumption.

Previously a typical error looked like this:

    sd 0:0:0:0: SCSI error: return code = 0x08000002
    sda: Current: sense key: Aborted Command
        Additional sense: Logical block reference tag check failed

You had to have the magic return value decoder ring handy to figure
out what had really happened.  And you had to do the mapping between
sd 0:0:0:0 and sda yourself.


The following patches clean up various bits so that the same
information can be presented in a more readable form:

    sd 0:0:0:0: [sda] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
    sd 0:0:0:0: [sda] Sense Key : Aborted Command [current] 
    sd 0:0:0:0: [sda] Add. Sense: Logical block reference tag check failed

All printk's from sd.c now have the same prefix.  For instance, if
logging is turned on we also get:

    sd 0:0:0:0: [sda] Send: 0x0fb89180 
    sd 0:0:0:0: [sda] CDB: Read(16): 88 20 00 00 00 00 00 00 00 20 00 00 00 08 00 00
    sd 0:0:0:0: [sda] Done: 0x0fb89180 SUCCESS

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