define dns_rdataclass_none as 254, not 0 (RFC2136); remove dns_rdatatype_none for consistency; add some meta-types
define dns_rdataclass_none as 254, not 0 (RFC2136); remove dns_rdatatype_none for consistency; add some meta-types

each/bind9-collab,pecharmin/bind9,pecharmin/bind9,each/bind9-collab,pecharmin/bind9,each/bind9-collab,pecharmin/bind9,each/bind9-collab,pecharmin/bind9,each/bind9-collab,pecharmin/bind9,each/bind9-collab