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On DigitalOcean, Network information is provided via Meta-data.
It changes the datasource to be a local datasource, meaning it
will run before fallback networking is configured.
The advantage of that is that before networking is configured it
can bring up a network device with ipv4 link-local and hit the
metadata service that lives at 169.254.169.254 to find its networking
configuration. It then takes down the link local address and lets
cloud-init configure networking.
The configuring of a network device to go looking for a metadata
service is gated by a check of data in the smbios. This guarantees
that the code will not run on another system.
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