L2SS-2256: Wow: I overlooked that I need to use the IDs of the images

bootstrap/sbin/rebuild_system_from_scratch.sh

@@ -49,7 +49,7 @@ function move_tango_dir_out_of_the_way()
 
 function remove_images()
 {
-    images="$(for i in $(docker images | egrep -v "REPOSITORY" | awk '{printf "%s:%s\n", $1, $2}'); do printf "%s " ${i}; done)"
+    images="$(for i in $(docker images -q); do printf "%s " ${i}; done)"
     if [ ${#images} -eq 0 ]; then
         echo -e "\tThere are no images to delete."
     else