Fix knightly pipeline

This PR is the combination of !23 (closed) !27 (closed) !28 (closed). Since the three PR is kind of in a circular dependency and hard to integrate and debug. So I create this new PR to make it easier.

ansible/group_vars/ood

 ---
   yum_repo_files:
     - cm.repo
+    - dell-system-update.repo
   pkg_list:
     - "BIOS_8JY6W_LN64_2.14.2-2.14.2"
     - "Diagnostics_Application_PX25H_LN64_4301A70_4301.71-4301A70"