util-linux/2.36.1-7 blocked on flaky systemd/247.3-1 test on ppc64el

[Chris Hofstaedtler <zeha@debian.org>]

Dear Release Team,

currently, util-linux/2.36.1-7 is blocked from migration because of
a failed test of systemd/247.3-1 on ppc64el. I'm told
"networkd-test.py" is known to be flaky.

As I can't seem to make that happen reproducibly for ci.debian.net,
could you please mark the test as known bad on ppc64el for now?
(And thus let util-linux migrate.)

More info from Michael Biebl:
  https://github.com/systemd/systemd/issues/18357
  https://github.com/systemd/systemd/issues/18196

Thanks,
Chris