run stacklight as separate step

Change-Id: I96aeeb64925cb214dd5f3176058c3e0ea8ac5a43
diff --git a/lab-pipeline.groovy b/lab-pipeline.groovy
index 8ebca89..fb99f24 100644
--- a/lab-pipeline.groovy
+++ b/lab-pipeline.groovy
@@ -393,7 +393,10 @@
                     sleep(10)
                 }
 
+            }
 
+
+            if (INSTALL.toLowerCase().contains('stacklight')) {
                 stage('Install StackLight') {
                     // infra install
                     // Install the StackLight backends