PIM-2370: Inject AttributeRepository into product one
PIM-2370: Move getIdentifierCode method
PIM-2370: Update Changelog.md
PIM-2370: Fix issue on ProductRepository ODM
PIM-2370: Remove useless code
PIM-2370: Take comment into accoutn
PIM-2370: Remove AttributeRepository dependency
PIM-2370: Finally inject AttributeRepository
Merge pull request #968 from akeneo/PIM-2370

PIM-2370: Move getIdentifier from ProductRepo to Attribute one