Handle non-sequential unit_number and 64 disks per controller limit in samples/add_disk_to_vm.py

[nryc]

Is your feature request related to a problem? Please describe.

Hi,

samples/add_disk_to_vm.py has currently two issues:

• it loops through vm.config.hardware.device and increment the last unit_number found, but the last unit_number of vm.config.hardware.device isn't necessarily the greatest (unit_number aren't sequential),
• the script sets a limit to 16 disks per controllers. Since vSphere 6.7, the limit is now 64 disks per controller.

Describe the solution you'd like

• to address the non-sequential unit_number, we should take the max unit_number found and increment it, not the last one,
• the limit for the number of disks per controller should be 64.

Describe alternatives you've considered

No response

Additional context

No response