ncm-metaconfig: support daemons with actions

In this case, the problem is that `restart` (for instance) doesn't exist until it's called for the first time (the method is generated by `AUTOLOAD`). So the `can` check above won't work. It passes tests because `Test::Quattor` bypasses `AUTOLOAD` and puts the appropriate names into the namespace, but in real executions I doubt it would work reliably.