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Configure the networking. This needs to be done each boot,
since the IP and interface information might have changed
due to reconfiguration.
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Run in init-local using a DHCP discovery prior to metadata crawl.
In init-local, no network is available. This subclass sets up minimal
networking with dhclient on a viable nic so that it can talk to the
metadata service. If the metadata service provides network configuration
then render the network configuration for that instance based on metadata.
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