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

roles/tgz_download/tasks/cached_version_fetch.yml

@@ -0,0 +1,21 @@
+---
+
+- name: Check for existing version cache file
+  stat:
+    path: "{{ atl_product_version_cache }}"
+  register: cached
+
+# Case: File exists, always use its value
+- name: Use version for product version
+  block:
+
+    - name: Read cached version from file
+      command: "cat {{ atl_product_version_cache }}"
+      register: atl_product_version_file
+      changed_when: false
+
+    - name: Set the local var to cached version
+      set_fact:
+        atl_product_version: "{{ atl_product_version_file.stdout }}"
+
+  when: cached.stat.exists