Converted to using the correct remap entries

Converted to using the correct remap entries

This follows the kernel changes to the blk_io_trace_remap structure to
better align the names of the structure elements with the real intent of
"from" and "to" (devices & sectors).

See the kernel patches @

http://lkml.org/lkml/2009/4/30/340
http://lkml.org/lkml/2009/4/30/341

(Note: since the ABI order didn't change, old user code will work with
the new kernel code & vice versa.)

Signed-off-by: Alan D. Brunelle <alan.brunelle@hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>