Fix del_disk authorization
Fix del_disk authorization

Roles having access to del_disk (delete all disks of the machine) should
also be able to use del_disk_disk (delete just one disk of the machine).

Addresses-Issue: Jira/AQUILON-1210
Change-Id: Iadf7f8895f547d7027214c000106505dd179f92a
Reviewed-By: Priya Joshi <3c6cfa6f57440adfc837c4ad04483313acbc2582@morganstanley.com>

stdweird/aquilon,quattor/aquilon,guillaume-philippon/aquilon,stdweird/aquilon,guillaume-philippon/aquilon,guillaume-philippon/aquilon,quattor/aquilon,quattor/aquilon,stdweird/aquilon