scripts: lhosts: add option to custom hosts url
scripts: lhosts: add option to custom hosts url

支持自定义 hosts 源，对下载失败进行处理

自定义 hosts 参考：

    tools/scripts/lhosts -u [hosts url]

获取帮助信息：

    tools/scripts/lhosts --help

脚本如果存在任何问题，请反馈至 https://github.com/racaljk/hosts

racaljk/hosts,Xiejiayun/hosts,Xiejiayun/hosts,Xiejiayun/hosts,wsdjeg/hosts,ruidalin/hosts,coolrc136/hosts,VegetaPn/hosts