keep-alive: drop unused nm_keep_alive_set_forced()
set-forced is currently unused, so drop it. NMKeepAlive in principle determines the alive-status based on multiple aspects, that in combination render the instance alive or dead. These aspects cooperate in a particular way. By default, a keep-alive instance should be alive. If there are conditions enabled that further determine the alive-state, then these conditions cooperate in a particular way. As it was, the force-flag would just overrule them all. But is that useful? The nm_keep_alive_set_forced() API also means that only one user caller can have control over the flag. Independent callers cannot cooperate on setting the flag, because there is no reference-counting or registered handles. At least today, it's unclear whether this flag really should overrule all other conditions and how this flag would actually be used. Drop it for now.
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