dns: add new DNS resolver and set it as default
This adds a new pure JavaScript resolver as the default DNS resolver and makes the old (c-ares) resolver behind a --use-old-dns flag.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This adds a new pure JavaScript resolver as the default DNS resolver and makes the old (c-ares) resolver behind a --use-old-dns flag.