Moving script request from InstallationContribution to NodeContribution

This way, the request will not be performed in each program once this URCap
is installed.

Author: Felix Exner

src/main/java/com/fzi/externalcontrol/impl/ExternalControlInstallationNodeContribution.java

@@ -65,8 +65,7 @@ public boolean isDefined() {
 
   @Override
   public void generateScript(ScriptWriter writer) {
-    RequestProgram sender = new RequestProgram(getHostIP(), getCustomPort());
-    urScriptProgram = sender.sendCommand("request_program\n");
+    
   }
 
   // IP helper functions
@@ -169,6 +168,8 @@ public void onOk(String value) {
   }
 
   public String getUrScriptProgram() {
+	RequestProgram sender = new RequestProgram(getHostIP(), getCustomPort());
+	urScriptProgram = sender.sendCommand("request_program\n");
     return urScriptProgram;
   }
 }