tests: fix dnssec/case_sensitivity, update SOA dump

tests-extra/tests/dnssec/case_sensitivity/data/modify-insensitive.awk

 # expected-changes -4 +5
 
 # SOA: name server, admin contect
-$4 == "SOA" { $5 = toupper($5); $6 = toupper($6) }
+$3 == "SOA" { $4 = toupper($4); $5 = toupper($5) }
 
 # NS: duplicate with different case
 $3 == "NS" && $4 ~ /^ns2\./ { print; $4 = toupper($4); }