Using AzureServicePrincipleTokenService in implementation of IServiceAccountJwtClient

Abhishek Patilrequested to merge
abpatil/token_generation into master

The token generation logic in implementation of IServiceAccountJwtClient is already there in AzureServicePrincipleTokenService class of core-lib-azure. Using AzureServicePrincipleTokenService class for the token generation logic.

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