[SERVER] iscsi: Unify usage of length and position variables

There were a lot of similarly named and redundant variables in various
structs named pos, len, xfer_len, des_xfer_pos, etc. It could be very
challenging to keep track of what information is stored where when
working with the code.
Attempt to minimize this by relying only on a single "len" variable in
the scsi_task struct.

This refactoring uncovered a few inconsistencies in how allocation
length limitations were handled, which were addressed here too.

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