CORD-1111 use prebuilt xosproject/xos image

Change-Id: Id689415b8919765284b12af6c4cfc977801876f4
diff --git a/profile_manifests/frontend.yml b/profile_manifests/frontend.yml
index af0daf6..19d4d46 100644
--- a/profile_manifests/frontend.yml
+++ b/profile_manifests/frontend.yml
@@ -32,3 +32,6 @@
 enabled_gui_extensions:
   - name: sample
     path: orchestration/xos-sample-gui-extension
+
+# Frontend's XOS does not use docker registry
+xos_docker_image: "xosproject/xos:candidate"