Generate comprehensive tests for ZoneAnalyzer utility class

Generate comprehensive tests for ZoneAnalyzer utility class

Test all combinations of wildcard, ENT, DNAME, NS, and ordinary
TXT records.

Test zone and expected outputs are generated by another script which
encodes node content into node name. This encoding removes 'node
content' level of indirection and thus enables simpler implementation of
same logic which needs to be in ZoneAnalyzer itself.

For humans the generated zone file also lists expected 'categories' a
name belongs to as dot-separated list on right hand side of a generated
RR.