change permission 0666 -> 0600

Signed-off-by: John lockman <john.lockman@friday.local>

roles/cluster_validation/tasks/fetch_password.yml

@@ -29,7 +29,7 @@
       {{ vault_key }}
     owner: root
     force: yes
-    mode: '0666'
+    mode: '0600'
   when: not vault_key_result.stat.exists
 
 - name: Check if omnia config file is encrypted