Added IPV6 Fact Check for Linux distros

lib/facter/ipv6.rb

@@ -0,0 +1,14 @@
+#  ipv6 support
+#  returns a true/false to see if the kernel has ipv6 support 
+#  installed and determine addresses
+
+require 'facter'
+Facter.add("ipv6") do
+    setcode do
+      ipv6_exists = 'unknown'
+      if Facter.value('kernel').value?('Linux')
+        ipv6_exists = File.exist?('/proc/net/if_inet6') ? true : false
+      end  
+      ipv6_exists
+    end
+end