rework the bus scanning code by splitting it out into separate functions

for walking the bus and targets, and probing the luns. this removes the
need to use magic numbers to wildcard each of these, which in turn makes
the code a lot easier to read. as a bonus we get some more space to work in
(80 chars isnt that much somtimes).

note that this code wont probe high luns if lun 0 doesnt exist.

ok krw@

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