[2377] Test skipping lines and comments

src/lib/dns/tests/testdata/example.org

@@ -8,4 +8,7 @@ example.org.        3600    IN  SOA ( ; The SOA, split across lines for testing
     7200
     )
 example.org.        3600    IN  NS ns1.example.org.
+
+
+; Some empty lines here. They are to make sure the loader can skip them.
 www.example.org.    3600    IN  A 192.0.2.1