[PATCH] IPv4 service address change for D.ROOT-SERVERS.NET (199.7.91.13)

D.ROOT-SERVERS.NET has been renumbered, see:

https://lists.dns-oarc.net/pipermail/dns-operations/2012-December/009428.html

ftp://ftp.internic.net/domain/named.root

http://blog.icann.org/2012/12/d-root/

http://d.root-servers.org/