View compute node partition subjects (capabilities)
Replaces https://lab.nexedi.com/nexedi/erp5/merge_requests/1852 to merge directly in master
See https://lab.nexedi.com/nexedi/slapos.core/merge_requests/584
Replaces https://lab.nexedi.com/nexedi/erp5/merge_requests/1852 to merge directly in master
See https://lab.nexedi.com/nexedi/slapos.core/merge_requests/584