[PATCH pvmove 2/3] support splitted destinations of pvmove

[Jun'ichi Nomura <j-nomura@ce.jp.nec.com>]

Currently, pvmove can't split destination area.
This patch removes the restriction.
(Actually, a prepration for removing the restriction.)

If you have 1GB LV on a contiguous area of PV1
and would like to move it to 2 x 500MB PVs, PV2 and PV3,
you have to manually split the pvmove session into 2.

It's because pvmove assumes 1-1 relationship between
source area and destination area and forces a contiguous allocation.

This patch changes pvmove completion to split the original segment
to map to the destination areas.

Other patch ("3/3" of this series) allows allocation of splitted areas
for a single source area.

Thanks,
-- 
Jun'ichi Nomura, NEC Corporation of America
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