neutron_router: Prohibit updating project_id/name

We already prohibit updating tenant_id and tenant_name. Because
the provider does not have logic to handle the update, we should also
prohibit updating these properties.

Change-Id: Iabab109d21cd0a09a75e1fd06740f7360723af48
(cherry picked from commit dae8ec409c)

lib/puppet/provider/neutron_router/openstack.rb

@@ -215,6 +215,8 @@ Puppet::Type.type(:neutron_router).provide(
     :availability_zone_hint,
     :tenant_id,
     :tenant_name,
+    :project_id,
+    :project_name
   ].each do |attr|
     define_method(attr.to_s + "=") do |value|
       fail("Property #{attr.to_s} does not support being updated")