add multiple tokens without changing featureset

controller/api/apiUtil_test.go

controller/controller.go

controller/interfaces/rbac/user.go

controller/northbound/server/auth.go

controller/northbound/server/auth_interceptor.go

controller/northbound/server/test_util_test.go

controller/northbound/server/user.go

controller/rbac/rbacService.go

controller/rbac/user.go

controller/rbac/userFileSystemStore_test.go