Pre-cache 3.3* images

Related-Prod: PRODX-3456
Change-Id: I87a1d8785445b3eefad9f57309db90c02d856d07
diff --git a/de/heat-templates/scripts/instance_boot.sh b/de/heat-templates/scripts/instance_boot.sh
index be5adea..b8f1293 100644
--- a/de/heat-templates/scripts/instance_boot.sh
+++ b/de/heat-templates/scripts/instance_boot.sh
@@ -174,7 +174,7 @@
 
     local image_prefix=${DOCKER_UCP_IMAGE%/*}
     local image_name=${DOCKER_UCP_IMAGE##*/}
-    if [[ "$image_name" =~ .*-tp[0-9]+ ]]; then
+    if [[ "$image_name" =~ .*3.3.* ]]; then
         for image in $(docker container run --rm --name ucp -v /var/run/docker.sock:/var/run/docker.sock ${DOCKER_UCP_IMAGE} images --list); do
             pull_image "${image_prefix}/${image##*/}"
             docker tag ${image_prefix}/${image##*/} ${image}