ipv4: change timeouts for @dhcp4_outages_in_various_situation
Created by: bengal
NM changed the way in which lease expirations are handled: before it stopped the client and respawned it 3 times at fixed intervals (2 minutes), while now it just keep the client running. dhclient tries to renew the lease immediately and then sleep for a random interval between 300 and 450 seconds.
Therefore, extend the timeout to be sure the client is able to renew the lease.