修改docker为国内镜像

{
        # "data-root": "/mnt/sda/docker",
        "graph": "/mnt/sda/docker",
        "registry-mirrors": ["https://reg-mirror.qiniu.com","https://kfwkfulq.mirror.aliyuncs.com","http://registry.docker-cn.com","http://hub-mirror.c.163.com"]}