[Backport] Use correct error message for duplicate error key in product import#16390

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gelanivishal wants to merge 2 commits intomagento:2.1-developfrom

gelanivishal:2.1-develop-PR-port-15980

Commits on Jun 25, 2018

during product import, use correct error message for duplicate error key

denteblu
authored and
gelanivishal
committed
Updated according to coding style requirements

ishakhsuvarov
authored and
gelanivishal
committed