apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/util/RoleUtils.java/RoleUtils/buildModifyDefaultNamespaceRoleName
class RoleUtils:  public static String buildModifyDefaultNamespaceRoleName(String appId) {
    return STRING_JOINER.join(RoleType.MODIFY_NAMESPACE, appId, ConfigConsts.NAMESPACE_APPLICATION);
  }