@Test
    void access_control_client_auth_defaults_to_need() {
        Http http = createModelAndGetHttp(
                "  <http>",
                "    <filtering>",
                "      <access-control />",
                "    </filtering>",
                "  </http>");
        assertTrue(http.getAccessControl().isPresent());
        assertEquals(AccessControl.ClientAuthentication.need, http.getAccessControl().get().clientAuthentication);
    }
@author gjoranv
@author bjorncs
@author mortent
config-model/src/test/java/com/yahoo/vespa/model/container/xml/AccessControlTest.java