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/cheaha.yml

@@ -4,7 +4,6 @@
   become: true
   roles:
     - { name: 'cheaha.node', tags: 'cheaha.node' }
-    - { name: 'install_packages', tags: 'install_packages' }
     - { name: 'nfs_mounts', tags: 'nfs_mounts' }
     - { name: 'ldap_config', tags: 'ldap_config' }
     - { name: 'slurm_client', tags: 'slurm_client' }