Parse hello-intervals as a number of seconds.
Parse hello-intervals as a number of seconds.

This is an incompatible change in the syntax of the config file.

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