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test: de-flake test-dns-idna2008.js

Rodrigo Muino Tomonari requested to merge github/fork/refack/fix-idna2008-test into master

Use a known well behaved DNS server.

/CC @nodejs/testing

Fixes: https://github.com/nodejs/node/issues/25870

P.S. ATM the DNS server configured on one of our CI workers, fails for the domain name used in this test:

root@test-rackspace-ubuntu1604-x64-1:~# nslookup xn--strae-oqa.de
;; Got SERVFAIL reply from 119.9.60.62, trying next server
Server:         119.9.60.63
Address:        119.9.60.63#53

** server can't find xn--strae-oqa.de: SERVFAIL

this causes the daily CI test of master to fail: https://ci.nodejs.org/job/node-test-commit-custom-suites/

Lookup works fine when directed to use 8.8.8.8

root@test-rackspace-ubuntu1604-x64-1:~# nslookup xn--strae-oqa.de 8.8.8.8
Server:         8.8.8.8
Address:        8.8.8.8#53

Non-authoritative answer:
Name:   xn--strae-oqa.de
Address: 81.169.145.78
Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines

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