Drop NetworkManager/ifupdown support for setups that are bound to an interface
This feature was mainly for laptops but users: - often don't care having the daemon running all the time; - may not want to use the 'main-interface' option because the interface that provides internet access is not always the same, e.g. wifi & wired; - may want other kinds of conditions, e.g. only specific wifi access points. So in practice, main-interface is currently only use to set up a DHCP server or provide IPv6 autoconfiguration. For such case, it is preferred to start/stop re6stnet like a normal service.
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