Merge pull request #600 from jonnytpuppet/gem_version_workaround

Workaround for rubygems/bundler#3187

Author: Helen

lib/puppet/type/firewallchain.rb

@@ -59,7 +59,7 @@
           if chain =~ /^(BROUTING|FORWARD)$/
             raise ArgumentError, "PREROUTING, POSTROUTING, INPUT, and OUTPUT are the only inbuilt chains that can be used in table 'nat'"
           end
-          if Gem::Version.new(Facter['kernelmajversion'].value) < Gem::Version.new('3.7') and protocol =~/^(IP(v6)?)?$/
+          if Gem::Version.new(Facter['kernelmajversion'].value.dup) < Gem::Version.new('3.7') and protocol =~/^(IP(v6)?)?$/
             raise ArgumentError, "table nat isn't valid in IPv6. You must specify ':IPv4' as the name suffix"
           end
         when 'raw'