test: use .test domain for not found address

[richardlau]

While it is extremely unlikely that .fhqwhgads will become a valid
domain, we should, where possible, use one of the reserved domains for
testing.

Refs: https://tools.ietf.org/html/rfc2606
Refs: #38282

cc @Trott

iojs@test-digitalocean-ubuntu1804-x64-1:~/build/workspace/node-test-commit-custom-suites-freestyle$ ./node 
Welcome to Node.js v16.0.0-pre.
Type ".help" for more information.
> const opts = { hints: 0, family: 0, all: false }
undefined
>  dns.promises.lookup('something.invalid', opts)
Promise { <pending> }
> Uncaught Error: getaddrinfo EAI_AGAIN something.invalid
    at __node_internal_captureLargerStackTrace (node:internal/errors:456:5)
    at __node_internal_ (node:internal/errors:678:10)
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (node:internal/dns/promises:42:17)
    at GetAddrInfoReqWrap.callbackTrampoline (node:internal/async_hooks:135:14) {
  errno: -3001,
  code: 'EAI_AGAIN',
  syscall: 'getaddrinfo',
  hostname: 'something.invalid'
}
>  dns.promises.lookup('something.invalid.test', opts)
Promise { <pending> }
> Uncaught Error: getaddrinfo ENOTFOUND something.invalid.test
    at __node_internal_captureLargerStackTrace (node:internal/errors:456:5)
    at __node_internal_ (node:internal/errors:678:10)
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (node:internal/dns/promises:42:17)
    at GetAddrInfoReqWrap.callbackTrampoline (node:internal/async_hooks:135:14) {
  errno: -3008,
  code: 'ENOTFOUND',
  syscall: 'getaddrinfo',
  hostname: 'something.invalid.test'
}
>  dns.promises.lookup('something.invalid.example', opts)
Promise { <pending> }
> Uncaught Error: getaddrinfo ENOTFOUND something.invalid.example
    at __node_internal_captureLargerStackTrace (node:internal/errors:456:5)
    at __node_internal_ (node:internal/errors:678:10)
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (node:internal/dns/promises:42:17)
    at GetAddrInfoReqWrap.callbackTrampoline (node:internal/async_hooks:135:14) {
  errno: -3008,
  code: 'ENOTFOUND',
  syscall: 'getaddrinfo',
  hostname: 'something.invalid.example'
}
> dns.promises.resolveMx('something.invalid')
Promise { <pending> }
> Uncaught Error: queryMx ESERVFAIL something.invalid
    at __node_internal_captureLargerStackTrace (node:internal/errors:456:5)
    at __node_internal_ (node:internal/errors:678:10)
    at QueryReqWrap.onresolve [as oncomplete] (node:internal/dns/promises:169:17)
    at QueryReqWrap.callbackTrampoline (node:internal/async_hooks:135:14) {
  errno: undefined,
  code: 'ESERVFAIL',
  syscall: 'queryMx',
  hostname: 'something.invalid'
}
> dns.promises.resolveMx('something.test')
Promise { <pending> }
> Uncaught Error: queryMx ENOTFOUND something.test
    at __node_internal_captureLargerStackTrace (node:internal/errors:456:5)
    at __node_internal_ (node:internal/errors:678:10)
    at QueryReqWrap.onresolve [as oncomplete] (node:internal/dns/promises:169:17)
    at QueryReqWrap.callbackTrampoline (node:internal/async_hooks:135:14) {
  errno: undefined,
  code: 'ENOTFOUND',
  syscall: 'queryMx',
  hostname: 'something.test'
}
> dns.promises.resolveMx('something.example')
Promise { <pending> }
> #Uncaught Error: queryMx ENOTFOUND something.example
    at __node_internal_captureLargerStackTrace (node:internal/errors:456:5)
    at __node_internal_ (node:internal/errors:678:10)
    at QueryReqWrap.onresolve [as oncomplete] (node:internal/dns/promises:169:17)
    at QueryReqWrap.callbackTrampoline (node:internal/async_hooks:135:14) {
  errno: undefined,
  code: 'ENOTFOUND',
  syscall: 'queryMx',
  hostname: 'something.example'
}
>

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/37556/

[richardlau]

Internet test: https://ci.nodejs.org/job/node-test-commit-custom-suites-freestyle/20345/

[richardlau]

Landed in 8645a36