Using AzureServicePrincipleTokenService in implementation for IServiceAccountJwtClient

Abhishek Patilrequested to merge
abpatil/token_generation into master

The implementation of IServiceAccountJwtClient is having code which is already there in AzureServicePrincipleTokenService in core-lib-azure. Thus modifying the implementation of IServiceAccountJwtClient to use AzureServicePrincipleTokenService for token generation logic.

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