Add a 'net' phase for loading user-data

Closed Natanael Copa requested to merge ncopa/tiny-cloud:phase-userdata into main

We need load user-data separately before running main phase but after network is up. Introduce a 'net' boot stage, similar to what cloud-init does.

ref: https://cloudinit.readthedocs.io/en/latest/explanation/boot.html#network ref: !53 (comment 306147)

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