Bastian Köcher ae0f7e58b0 Make --file optional for generate-node-key (#7043)
This pr makes the `--file` argument optional to `generate-node-key`.
If the argument is not given, the secret node key will be printed to
`stdout`. The public node key will always be printed to `stderr`.
2020-09-08 10:32:37 +02:00
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