Create export and import of SDN configuration

We need a way to export and import the SDN configuration.

The proposed solution are two NBI endpoints, one for exporting and one for importing. The cli (and possible other apps) can then utilize it.

After an configuration is imported, it should be applied to all devices.

Endpoint should demand high permissions.

At least username and password should be encrypted later.

Open question: What happens, if the import is successful database wise, but the apply to the network elements is not fully successful? Rollback? Accept import for now and try application later?

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