node/dns.ts crashes with UNKNOWN error if --allow-net permission is missing

[talentlessguy]

Describe the bug

node/dns.ts Server crashes with UNKNOWN error if --allow-net is not provided. This case should be handled like in a regular http server.

Steps to Reproduce

import { Server } from 'https://deno.land/std/node/net.ts'

const s = new Server()

s.listen(3000)

$ deno run example.js

Expected behavior

Throw permission error

Environment

• OS: Linux
• deno version: 1.15.1
• std version: 0.111.0