Add LegacyExchangeKey parameter

code/templates/diraccertif.cfg.erb

@@ -70,6 +70,10 @@ DIRAC
     <% end %>
   }
 }
+DiracX
+{
+  LegacyExchangeApiKey = %TEIGI__<%= @dirac_config_args['setup'] %>_legacy_exchange_api_key__%
+}
 LocalSite
 {
   Site = <%= @server_name %>