Add fs 'sync' after user-data script if failed

Change-Id: I964b4fb1328214133d9e4c60f0630dea781214d7
diff --git a/tcp_tests/templates/cookied-model-generator/underlay.yaml b/tcp_tests/templates/cookied-model-generator/underlay.yaml
index 4783bd8..ef444e7 100644
--- a/tcp_tests/templates/cookied-model-generator/underlay.yaml
+++ b/tcp_tests/templates/cookied-model-generator/underlay.yaml
@@ -68,6 +68,11 @@
             forward:
               mode: route
 
+        group_volumes:
+         - name: cfg01_day01_image               # Pre-configured day01 image
+           source_image: {{ os_env('IMAGE_PATH_CFG01_DAY01') }} # http://images.mirantis.com/cfg01-day01.qcow2
+           format: qcow2
+
         nodes:
           - name: {{ HOSTNAME_CFG01 }}
             role: salt_master
@@ -81,7 +86,7 @@
               volumes:
                 - name: system
                   capacity: {{ os_env('CFG_NODE_VOLUME_SIZE', 150) }}
-                  shared_backing_store_name: {{ os_env('CFG01_DAY01_VOLUME_NAME') }}
+                  backing_store: cfg01_day01_image
                   format: qcow2
                 - name: iso  # Volume with name 'iso' will be used
                              # for store image with cloud-init metadata.