- addrconf: rewrite to run lease updates in background jobs and use
  netconfig 0.84 batch support if available (bsc#989741).
  Fixed auto4 and dhcp supplicants to explicitly stop device before
  unregistering dbus object to disarm it and return release request
  result before sensing the released event.
  Fixed fsm to not advance fsm state on unrelated events and use new
  call to refresh addresses from kernel for tentative checks in ifup.