3464c602e8
Until now the startup failed with an error like this: ``` com.github.joschi.jadconfig.ValidationException: Parent path /var/lib/graylog/server for Node ID file at /var/lib/graylog/server/node-id is not a directory ``` This happens since `graylog.service` ensures that `/var/lib/graylog` exists, however it doesn't take care of the directory for `cfg.nodeIdFile`.
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