DCD-224: Refactor installer role to work around various quirks.

roles/installer_download/tasks/fetch_product.yml

@@ -15,11 +15,18 @@
   template:
     src: "{{ atl_product_family }}.varfile.j2"
     dest: "{{ atl_product_varfile }}"
+    mode: 0755
 
+# NOTE: We run the installer as the user rather than root to limit its
+# actions. For example, if root and the 'jira' user exists then it
+# will create 'jira1'; this potentially creates idempotency/upgrade
+# issues down the line.
 - name: Run the installer
   command: /bin/sh "{{ atl_product_download }}" -q -varfile "{{ atl_product_varfile }}"
   args:
     creates: "{{ atl_product_installation_versioned }}/.install4j/"
+  become: true
+  become_user: "{{ atl_product_user }}"
 
 - name: Symlink the installed version to current
   file: