remove bson & pandora support

hydro/service/server.js

@@ -2,7 +2,7 @@ const assert = require('assert');
 const path = require('path');
 const os = require('os');
 const _ = require('lodash');
-const { ObjectID } = require('bson');
+const { ObjectID } = require('mongodb');
 const Koa = require('koa');
 const yaml = require('js-yaml');
 const morgan = require('koa-morgan');