Improve test coverage of rbac stuff

Description

Trying to improve coverage. 🥴

Related Issue

#207 (closed)

controller/northbound/server/auth_interceptor.go

@@ -60,7 +60,6 @@ func (auth *AuthInterceptor) Stream() grpc.StreamServerInterceptor {
 		info *grpc.StreamServerInfo,
 		handler grpc.StreamHandler,
 	) error {
-
 		err := auth.authorize(stream.Context(), info.FullMethod)
 		if err != nil {
 			return err
@@ -132,7+131,7 @@
 			if err != nil {
 				return err
 			}
 		}
 
 		if foundRoleInStorage {
 			return nil