Merge pull request #389 from alexeygrigorovaurea/jnlp-tunnel-fix

populate jnlp tunnel in the jnlp endpoint

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

@@ -472,7 +472,7 @@ public KubernetesSlave build() throws IOException, Descriptor.FormException {
                     nodeDescription == null ? podTemplate.getName() : nodeDescription,
                     cloud.name,
                     label == null ? podTemplate.getLabel() : label,
-                    computerLauncher == null ? new KubernetesLauncher() : computerLauncher,
+                    computerLauncher == null ? new KubernetesLauncher(cloud.getJenkinsTunnel(), null) : computerLauncher,
                     retentionStrategy == null ? determineRetentionStrategy() : retentionStrategy);
         }
     }