test: fix flaky test-*-connect-address-family

Skip tests if localhost does not resolve to ::1.

Fixes: https://github.com/nodejs/node/issues/7288
PR-URL: https://github.com/nodejs/node/pull/7605


Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>