Cost param missing from importShippingRate Method

[bvboas]

In the

\Magento\Quote\Model\Quote\Address\Rate

the

importShippingRate

does not retrieve the shipping cost for that quote.

This issue was already present in M1, but saving the order shipping cost is a good idea.

DB schema changes are necessary and the following line should be added to the above method

->setCost($rate->getCost())

[kassner]

I think #1008 already requests that. Shame on me, I abandoned it completely.

[piotrekkaminski]

Internal issue: MAGETWO-34880