配置定义

简单的配置，可以将内容完全存储在 etcd 中，如：

etcdctl put /configs/remote_config.json -- '{"addr":"127.0.0.1:1080","aes_key":"01B345B7A9ABC00F0123456789ABCDAF","https":false,"secret":"","private_key_path":"","cert_file_path":""}'

etcdctl get /configs/remote_config.json
{
    "addr" : "127.0.0.1:1080",
    "aes_key" : "01B345B7A9ABC00F0123456789ABCDAF",
    "https" : false,
    "secret" : "",
    "private_key_path" : "",
    "cert_file_path" : ""
}