fix: no cleanup of config if not updated

Author: csviri

core/src/main/java/io/javaoperatorsdk/jenvtest/KubeAPIServer.java

@@ -55,7 +55,9 @@ public void stop() {
     log.debug("Stopping");
     kubeApiServerProcess.stopApiServer();
     etcdProcess.stopEtcd();
-    kubeConfig.restoreKubeConfig();
+    if (config.isUpdateKubeConfig()) {
+      kubeConfig.restoreKubeConfig();
+    }
     etcdProcess.cleanEtcdData();
     log.debug("Stopped");
   }