Include ihu_interval in ihu messages.
Include ihu_interval in ihu messages.

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