Move some code around in interface_up.
Move some code around in interface_up.

Drooids/babeld,jech/babeld,wlanslovenija/babeld,dtaht/babeld-shortrtt-metrics,Gwendocg/babeldToS,boutier/babeld,tcatm/babeld,jech/babeld,wlanslovenija/babeld,Gwendocg/babeldToS,sudomesh/babeld,woniullb/babeld