[WIP] align configuration index to align with group uniqueness

[AlvaroVega]

related with iotagent-node-lib#1633 iotagent-node-lib#1589

[coveralls]

Pull Request Test Coverage Report for Build 11439381372

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.1%) to 76.104%

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Totals
Change from base Build 10925707886:	-0.1%
Covered Lines:	545
Relevant Lines:	677

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💛 - Coveralls