Temponarily disable running model tests on hardware nodes

Change-Id: Id5d1b90913cea91e2e9efd2e5d498e0da94ff045
diff --git a/test-salt-model-node.groovy b/test-salt-model-node.groovy
index cc5c7be..b7c616b 100644
--- a/test-salt-model-node.groovy
+++ b/test-salt-model-node.groovy
@@ -29,7 +29,7 @@
 def checkouted = false
 
 throttle(['test-model']) {
-  node("python") {
+  node("python&&virtual") {
     try{
       stage("checkout") {
         if(defaultGitRef != "" && defaultGitUrl != "") {