Add the protocol name to nat-rule-port

Now the nat-rule-port always has the protocol name, see here:
https://lab.nexedi.com/nexedi/slapos/blob/9a886c4b0c6dd229564292eaa0ef2604fa857aea/software/kvm/instance-kvm.cfg.jinja2#L843

software/erp5testnode/testsuite/deploy-test/instance-deploy-test.cfg.jinja2

@@ -55,8 +55,8 @@ return =
   url
   backend-url
   ipv6
-  nat-rule-port-443
-  nat-rule-port-80
+  nat-rule-port-tcp-443
+  nat-rule-port-tcp-80
 
 [directory]
 recipe = slapos.cookbook:mkdirectory