fix port number conversion to string issue

NEWS

@@ -2,6 +2,9 @@ release/005.008 (unreleased)
 
     [ssh] Add $max_sessions options. [adamhl]
 
+    [iptables] Ensure that port numbers are converted to strings inside
+    the rules erb file to avoid Ruby errors. [adamhl]
+
 release/005.007 (2017-06-22)
 
     [kerberos] Add option to completely override /etc/krb5.conf using

templates/iptables/rule.erb

 <%# Generic iptables rule template used by iptables::rule. -%>
 # <%= @name %><% if @description != '' then %> -- <%= @description %><% end %>
 <% [@port].flatten.each do |pt|              -%>
-<%   p = (pt != '') ? '--dport ' + pt : ''   -%>
+<%   p = (pt.to_s() != '') ? '--dport ' + pt.to_s() : ''   -%>
 <%   [@source].flatten.each do |src|         -%>
 <%     [@protocol].flatten.each do |pr|      -%>
 <%       syn = (pr == 'tcp') ? ' --syn' : '' -%>