templates/packer/ansible: fix unregister

The community redhat_subscription module calls `subscription-manager
unsusbscribe`, which doesn't exist. Use shell for now.

templates/packer/ansible/roles/common/tasks/main.yml

@@ -12,8 +12,8 @@
 # Configure the worker.
 - include_tasks: worker-config.yml
 
-# Unsubscribe
-- include_tasks: unsubscribe.yml
+# Unregister
+- include_tasks: unregister.yml
 
 - name: Ensure SELinux contexts are updated
   command: restorecon -Rv /etc

templates/packer/ansible/roles/common/tasks/unregister.yml

@@ -0,0 +1,8 @@
+---
+
+- name: Unregister
+  become: yes
+  tags:
+    - subscribe
+  shell: >-
+    subscription-manager unregister

templates/packer/ansible/roles/common/tasks/unsubscribe.yml

@@ -1,7 +0,0 @@
----
-
-- name: Unsubscribe
-  tags:
-    - subscribe
-  community.general.redhat_subscription:
-    state: absent