Use root.hints from dns-root-data

Bernhard Schmidtrequested to merge
bug888491 into master

Use an up-to-date copy of the DNS root hints file in the default configuration

Do NOT clean up the old db.root conffile, it is usually unchanged (and would thus be deleted by dpkg-maintscript-helper), but may still be referenced by the users configuration.

Closes: #888491

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