Replace authenticated_consumer with authenticated_credential

[Trojan295]

Fix for #38 authenticated_consumer should be used only, when the consumer is registered in Kong. For consumers not registered in kong authenticated_credential should be used, which is true in case of external OIDC Providers.

[coveralls]

Pull Request Test Coverage Report for Build 61

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 54.795%

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Totals
Change from base Build 60:	0.0%
Covered Lines:	1040
Relevant Lines:	1898

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💛 - Coveralls