user/node: re-enable flaky tests.

These tests fail when /etc/hosts does not contain an IPv6
entry for localhost ('::1 localhost'). It isn't immediately
clear to me whether the tests are therefore buggy, or if we
want to put the blame on a non-conforming build environment.

This was initially discovered on a system that only had an
IPv4 entry ('127.0.0.1 localhost'), which occurred because
the autobuilder tool copied /etc/{hosts,hostname,resolv.conf}
from the host into the rootfs for each build environment, and
each host may be running a different Linux distribution.

This is being addressed in adelie-infra/autobuilder#33, which
will ensure build environments are consistent in this way.

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