Improve test coverage of rbac stuff

controller/api/apiUtil_test.go

controller/api/auth_test.go

controller/api/initialise_test.go

controller/api/role.go

controller/api/role_test.go

controller/api/user.go

controller/api/user_test.go

controller/controller.go

controller/northbound/server/auth.go

controller/northbound/server/auth_interceptor.go

controller/northbound/server/auth_interceptor_test.go

controller/northbound/server/auth_test.go

controller/northbound/server/pnd_test.go

controller/northbound/server/role_test.go

controller/northbound/server/test_util_test.go

controller/northbound/server/user_test.go