Don't include A records from "Additional" and "Authority" sections of…

… the DNS response

libraries/core.rb

@@ -316,7 +316,7 @@ def expand_ips(node, target, options, name)
         require 'dnsruby'
         resolver = Dnsruby::Resolver.new
         response = resolver.query(target)
-        response.each_resource do |r|
+        response.each_answer do |r|
           if r.type.eql?('A')
             ips.push(r.address)
           end