Implement kernel_interface_operational for socket interface.
Implement kernel_interface_operational for socket interface.

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