add ipv6forwarding param

[AxisNL]

Hey, could you please include the ipv6forwarding param in globals? These commits should do it. (I have no idea how this pull stuff works):

diff --git a/modules/network/manifests/global.pp b/modules/network/manifests/global.pp
index f486fbc..71e15be 100644
--- a/modules/network/manifests/global.pp
+++ b/modules/network/manifests/global.pp
@@ -67,21 +67,27 @@
   $nisdomain      = undef,
   $vlan           = undef,
   $ipv6networking = false,
+  $ipv6forwarding = false,
  $nozeroconf     = undef) {
   # Validate our data
..
   validate_bool($ipv6networking)
+  validate_bool($ipv6forwarding)

diff --git a/modules/network/templates/network.erb b/modules/network/templates/network.erb
index a4e3c23..1505832 100644
--- a/modules/network/templates/network.erb
+++ b/modules/network/templates/network.erb
@@ -4,6 +4,8 @@
 <% if !@ipv6networking %>NETWORKING_IPV6=no
 <% else %>NETWORKING_IPV6=yes
+<% if !@ipv6forwarding %>IPV6FORWARDING=no
+<% else %>IPV6FORWARDING=yes
 <% if @ipv6gateway %>IPV6_DEFAULTGW=<%= @ipv6gateway %>
 <% end -%>