DCD-224: Rename product_download to tgz_download in prep for an alternative installer.

roles/tgz_download/tasks/cached_version_write.yml

@@ -0,0 +1,8 @@
+---
+
+# At this point atl_product_version should be set, cache if necessary.
+- name: Write override cached version when specified
+  template:
+    src: version.j2
+    dest: "{{ atl_product_version_cache }}"
+    force: false