Add setter for authority prefix in JwtGrantedAuthoritiesConverter (Spring Security)

Spring Security is a powerful and highly customizable authentication and access-control framework. It is the de-facto standard for securing Spring-based applications. 

Prior to this change mapped authorities are always prefixed with default value ‘SCOPE_'. To change this default behaviour the converter had to be replaced completely with a custom one. This commit adds an additional setter to configure a custom authority prefix like e.g. ‘ROLE_'. Without specifying a custom prefix the default prefix still remains ‘SCOPE_'. This way existing authorization checks using the standard ‘ROLE_’ prefix can be reused without lots of effort.

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Commit: "cd452ff"

LastMod Date using GitInfo: cd452ff