[Backport] [Fix] forgot to add lowercase conversion on grouped product assignation#15751

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vijay-wagento wants to merge 1 commit intomagento:2.1-developfrom

vijay-wagento:2.1-develop-PR-port-15312

Commits on Jun 4, 2018

forgot to add lowercase conversion on grouped product assignation after changes done in MAGETWO-67240 - See changes done for MAGETWO-67240 here https://github.com/magento/magento2/commit/02596b720f…

jalogut
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vijay-wagento
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