Reset the per-interface activity timer when upping a network.
Reset the per-interface activity timer when upping a network.

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