storage: Round up capacity for LVM volume creation
storage: Round up capacity for LVM volume creation

If vol->capacity is odd, the capacity will be rounded down
by devision, this patch is to round it up instead of rounding
down, to be safer in case of one writes to the volume with the
size he used to create.

- src/storage/storage_backend_logical.c: make sure size is not rounded down
(cherry picked from commit 6002e0406c338668ea0ecbfeb6c1ef20a8b67efe)

Signed-off-by: Steve Hodgson <eb20a6615749cf04ff61aa37e18f749ed6d01446@solarflare.com>

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