IPv6 localhost isn't defined in /etc/hosts on AIX

[gibfahn]

This ws test is failing on CitGM because our AIX boxes are missing the ::1 localhost line from /etc/hosts, despite having IPv6 enabled. I have confirmed that appending that line fixes the issue (I then removed it again).

bash-4.3$ node -e "require('dns').lookup('localhost', {family: 6}, (err, address, family) => console.log(err,address,family))"
{ Error: getaddrinfo ENOTFOUND localhost
    at errnoException (dns.js:28:10)
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:76:26)
  code: 'ENOTFOUND',
  errno: 'ENOTFOUND',
  syscall: 'getaddrinfo',
  hostname: 'localhost' } undefined undefined

bash-4.3$ echo "::1             localhost" >>/etc/hosts

bash-4.3$node -e "require('dns').lookup('localhost', {family: 6}, (err, address, family) => console.log(err,address,family))"
null '::1' 6

I'd suggest we add this to /etc/hosts on the machines, and also to the setup instructions.

cc/ @mhdawson

[mhdawson]

@gibfahn can you go ahead and do that ?

[gibfahn]

Added to both test machines, PR is #728

CI run on AIX to make sure everything's still kosher: https://ci.nodejs.org/job/node-test-commit-aix/5980/

EDIT: CI is green

[treysis]

I think smartos18 is also affected by this in some way. The debugger is listening on ::1, but the tests trying to connect to 127.0.01.

Maybe related to failing of nodejs/node#37681