code: public static BinaryResponse createGetConfig(BinaryCommand command, MemcachedServer server) {
          return create(command, server, ErrorCode.SUCCESS, ErrorCode.NOT_SUPPORTED);
      }
docs: Creates a response for {@code CMD_GET_CONFIG}
  @param command The command received
  @param server The server
  @return A response containing the config with a successful code, or
  an empty response with NOT_SUPPORTED