CORD-2878 use xos-core instead of xos-ui

Change-Id: I604393f970e6d32bce0fc6cf345b683f549f8a12
diff --git a/scenarios/preppedkube/config.yml b/scenarios/preppedkube/config.yml
index aabb966..db04ae2 100644
--- a/scenarios/preppedkube/config.yml
+++ b/scenarios/preppedkube/config.yml
@@ -100,8 +100,7 @@
 # images for imagebuilder to build/pull (tagged elsewhere)
 docker_image_whitelist:
   - "xosproject/xos-base"
-  - "xosproject/xos"
-  - "xosproject/xos-ui"
+  - "xosproject/xos-core"
   - "xosproject/xos-client"
   - "xosproject/xos-gui"
   - "xosproject/xos-gui-builder"