circleci: update to fedora 30
circleci: update to fedora 30

And install dbus-daemon manually, until we figure out how to correctly start
the new dbus-broker this will at least help us pass the tests.

And disable nss-systemd so we don't suffer from timeouts as dbus-daemon waits
for that to time out, see c4257802206186b891bea8d055c14b03772a64bf for details.

Signed-off-by: Peter Hutterer <b9c50af7afa7642f6f854434cda9ffe54ece8b85@who-t.net>

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