resolver: add missing . NS signatures to val_nsec3_optout_unsec_cache
There is a trick: Original answer to query `. NS` contains a lot of NS names which are not interesting for the test itself. The additional section supplies just single IP address and the test does not contain root-servers.net. domain and related infrastructure. This works with current kresd but might break in future if kresd starts to require all names (or IPv6 or so).
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