+3556. [maint] Added AAAA for D.ROOT-SERVERS.NET.
+
3555. [bug] Address theoretical race conditions in acache.c
(change #3553 was incomplete). [RT #33252]
"B.ROOT-SERVERS.NET. 3600000 IN A 192.228.79.201\n"
"C.ROOT-SERVERS.NET. 3600000 IN A 192.33.4.12\n"
"D.ROOT-SERVERS.NET. 3600000 IN A 199.7.91.13\n"
+"D.ROOT-SERVERS.NET. 3600000 IN AAAA 2001:500:2d::d\n"
"E.ROOT-SERVERS.NET. 3600000 IN A 192.203.230.10\n"
"F.ROOT-SERVERS.NET. 3600000 IN A 192.5.5.241\n"
"F.ROOT-SERVERS.NET. 3600000 IN AAAA 2001:500:2F::F\n"