Merge pull request jenkinsci#26 from flandr/retention-race

Avoid race with OnceRetentionStrategy timeout

Author: ndeloof

src/main/java/org/csanchez/jenkins/plugins/kubernetes/KubernetesSlave.java

@@ -50,7 +50,7 @@ public KubernetesSlave(PodTemplate template, String nodeDescription, KubernetesC
                 Node.Mode.NORMAL,
                 label == null ? null : label.toString(),
                 new JNLPLauncher(),
-                new OnceRetentionStrategy(0),
+                new OnceRetentionStrategy(/*minutes idle*/ 1),
                 Collections.<NodeProperty<Node>> emptyList());
 
         // this.pod = pod;