Make awk regular expressions more precise in the "dnssec" system test
The /IN *SOA/ regular expression can give a false positive match. For example, the following line matches, which is unexpected for the test: example. 60 IN DNSKEY 257 3 13 oCFm3P5uMtWuqXqbyUUlHHNgjCztzASAFhXUlnnudcYkYmNwOwYm6jah RewD1COujT/Lj2+JyKDV3sFRrINSOA== It detects the "INSOA" sub-string in the base64-encoded data. Change the regular expression to make it more precise.