Add uplink provider network to neutron network

At midonet we are using a custom provider network
type since edge router is also inside our managed
topology

Change-Id: I22ca765c2e83218d82c9826e8dae753ddfa365dc

lib/puppet/type/neutron_network.rb

@@ -42,7 +42,7 @@ Puppet::Type.newtype(:neutron_network) do
 
   newproperty(:provider_network_type) do
     desc 'The physical mechanism by which the virtual network is realized.'
-    newvalues(:flat, :vlan, :local, :gre, :l3_ext, :vxlan)
+    newvalues(:flat, :vlan, :local, :gre, :l3_ext, :vxlan, :uplink)
   end
 
   newproperty(:provider_physical_network) do