Merge pull request #2430 from lnykryn/is-active-failed

systemctl: is-active/failed should return 0 if at least one unit is in given state

Previously:
[lnykryn@notas lnykryn-systemd(is-active-failed)]$ systemctl is-failed fail cups; echo $?
failed
active
1

now:
[lnykryn@notas lnykryn-systemd(is-active-failed)]$ ./systemctl is-failed fail cups; echo $?
failed
active
0