Implement all of the get properties and methods for DNS

The hard part here was generating the expected listRRs response. Ruby to the rescue!

require 'json'
puts [{:name=>"example.com", :type=>"A", :data=>"127.0.0.1", :ttl=>60}, {:name=>"example.com", :type=>"MX", :data=>"mail.example.com", :ttl=>3600}].to_json