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A snapshot id must be provided to ceph_calc_raw_layout() even though
it is not needed at all for calculating the layout.

Where the snapshot id *is* needed is when building the request
message for an osd operation.

Drop the snapid parameter from ceph_calc_raw_layout() and pass
that value instead in ceph_osdc_build_request().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>