支持NPM服务配置Cache-Control响应头

[cnlkl]

What would you like to be added:

支持配置NPM服务Cache-Control响应头内容

Why is this needed:

目前packageInfo接口未返回Cache-Control响应头，会导致npm install时不缓存相关制品

npm install --loglevel verbose
// 永远是cache updated
npm http fetch GET 200 http://bkrepo.example.com/npm/blueking/npm-local/@xxxx/xxxx xxms (cache updated)