CORD-2817 remove xos-core steps from Makefile

Change-Id: If81ea302cd5551d3875061244fa73bf506050016
diff --git a/scenarios/mock/config.yml b/scenarios/mock/config.yml
index 5db6506..51d045a 100644
--- a/scenarios/mock/config.yml
+++ b/scenarios/mock/config.yml
@@ -62,6 +62,7 @@
 docker_image_whitelist:
   - "xosproject/xos-base"
   - "xosproject/xos"
+  - "xosproject/xos-ui"
   - "xosproject/xos-client"
   - "xosproject/xos-corebuilder"
   - "xosproject/xos-gui"