fix base64 encoding of key field in config

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The security.privateKey and security.publicKey fields are of type bytes,
but the protobuf MessageToDict converts them to base64 encoded strings.
When importing the config again, this is read as a string, which breaks
the import. Instead, the value needs to be prefixed with "base64:", so
the type handling logic on import kicks in and decodes the value to a
bytes array again.

Fixes: #678

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