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When Interface::handle_config_3 (third step of applying a new configuration to interfaces) tried to detach the interface from the current IP config because the old and new IP config differed, it did so using the new domain. The former steps of the reconfiguration already installed the new domain reference at the interface. Therefore, also the DHCP server of the new domain was used. This, however caused uncaught exceptions because detaching from an IP config includes dissolving all DHCP allocations. This dissolving of DHCP allocations now operated on a DHCP server (the one of the new domain) that wasn't related to the allocations and, in the worst case, caused an uncaught exception because the IPs were out of its range. That said, this commit ensures that detaching an interface from an IP config is always done on the domain from which the IP config originated. Normally, this is the domain the interface is attached to. But in the case of Interface::handle_config_3, it is another - the former domain the interface was attached to. The commit also adapts the nic_router_dhcp_* tests in a way that they reconfigure the router in a way that would trigger the uncaught exception without the fix. Fixes #4200