ipv4: fix dhcp_rebind test
It's sometimes not enough to have max and default lease times both set to 120s as there is just 120/8=15 seconds to send out the rebind message and this can sometimes fail.
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It's sometimes not enough to have max and default lease times both set to 120s as there is just 120/8=15 seconds to send out the rebind message and this can sometimes fail.