--- Resolv::DNS#getaddress(name)
--- Resolv::DNS#getaddresses(name)
--- Resolv::DNS#each_address(name) {|address| ...}
    address lookup methods.

    name must be a instance of Resolv::Name or String.  Lookupped
    address is represented as an instance of Resolv::IPv4 or Resolv::IPv6.

