[issue8598] test/support: don't use localhost as IPv6 host name

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> It has long been true that there are test failures 
> if the testing system cannot resolve its own hostname,
> ...

I'm not sure that "localhost" must be resolved to ::1. I'm only sure for IPv4: localhost be must resolved to 127.0.0.1 in IPv4.

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