Timeout on RHEL subscription check (#12115)

subscription-manager status can in some circumstances just never
terminates, with nothing indicating the problem from the Ansible
playbook log.
This makes it difficult to find the hosts misbehaving.

Add a timeout to the subscription checks (defaulting to 3 minutes). This
should be more than enough for normal circumstances while allowing
easier troubleshooting, as the hosts will be FAILED instead of the
playbook just waiting indefinitely.

roles/bootstrap-os/tasks/rhel.yml

@@ -28,6 +28,7 @@
   register: rh_subscription_status
   changed_when: "rh_subscription_status.rc != 0"
   ignore_errors: true  # noqa ignore-errors
+  timeout: "{{ rh_subscription_check_timeout }}"
   become: true
 
 - name: RHEL subscription Organization ID/Activation Key registration