test: handle IPv6 localhost issues within tests

The issue of hosts that do not resolve `localhost` to `::1` is now
handled within the tests. Remove flaky status for
test-https-connect-address-family and test-tls-connect-address-family.

PR-URL: https://github.com/nodejs/node/pull/7766


Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>