re6st-registry: Refactor integration with re6st registry
* Follow up methods changes on re6stnet registry API. * getIPv4Information was simplifed on registry, so reimplement it. * Remove scripts generated and keep a single script to orchestate the token management. * Drop some code duplication * Remove babeld, openvpn and miniupnp as they are not required. * Remove useless scripts. * Remove re6stnet section, extra-eggs is more them enough and prevent duplications.
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