Removing osd with zero data causes placement shift

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Hello

I had a couple of osds with down+out state and completely clean
cluster, but after pushing a button ``osd crush remove'' there was
some data redistribution with shift proportional to osd weight in the
crushmap but lower than 'osd out' amount of data replacement over osd
with same weight approximate two times. This is some sort of
non-idempotency kept at least from bobtail series.
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