ifconfig: refresh only addrs + routes on lease update
dbus,ifconfig: disabled interface refreshes
ifconfig: do not refresh all interfaces on creation

Instead to make a full refresh of all interfaces, get just basics
device info of the created interface and let events update the rest.
events: process complete device state change events
events: integrated device-ready in state transition
events: ensure, that objects are created once
wickedd: cleaned up event forwarding artifacts

do not fake down event when delete event arrives.
nanny: enabled nanny use for hotplugging (bnc#880515)

To disable again in case of trouble, edit /etc/wicked/common.xml
and set <use-nanny>false</use-nanny>, restart wickedd.service and
execute "wicked ifup all" to start the interfaces directly.
version 0.5.37
Merge pull request #340 from mtomaschewski/event-order-4

events: process complete device state change event transitions