tests: fail if there are not enough disks for testing

Author: yontalcar

tests/get_unused_disk.yml

@@ -9,11 +9,9 @@
     unused_disks: "{{ unused_disks_return.disks }}"
   when: "'Unable to find unused disk' not in unused_disks_return.disks"
 
-- block:
-    - name: Exit playbook when there's not enough unused disks in the system
-      debug:
-        msg: "Unable to find enough unused disks. Exiting playbook."
-    - meta: end_play
+- name: Exit playbook when there's not enough unused disks in the system
+  fail:
+    msg: "Unable to find enough unused disks. Exiting playbook."
   when: unused_disks is undefined or unused_disks|length < disks_needed|default(1)
 
 - name: Print unused disks