events: process complete device state change event transitions

The ifdown events we emit via dbus (to nanny) were in reversed order, in several cases
we didn't emitted events due to manual refreshes killing the differences on the links and
which are not needed (artifact), as we get the updates via netlink events anyway and just
need to process and forward in correct order (bnc#884012,bnc#880515 prerequires).