DNS library (client and server support)

Table of Contents
gskdns -- 
gskdnsrrcache -- A cache of Resource Record data.
gskdnsclient -- This is a DNS client.
gskdnslocalresolver -- a DNS resolver which uses just a local resource-record cache.
gskdnsresolver -- An interface that DNS resolvers provide.
gskdnsserver -- base class for a DNS server.