Fix vm disk remove

[justinc1]

Sometimes we can remove disk from a running VM, and sometimes we need to shutdown VM before disk can be removed. It depends on HyperCore thinking VM might be using the disk.

The PR:

• first tries to remove disk from a running VM (the behaviour before this PR)
• if this fails, it shutdowns VM, tries delete a second time and start VM back

Integration tests for all this is included, for vm and vm_disk modules. It covers 3 cases:

• VM being off
• VM running and cannot be shutdown (it does not respond to nice shutdown, and force shutdown is not allowed)
• VM running and can be shutdown (force shutdown is allowed)

A small bug in vm_disk module was also fixed. The module didn't start back VM if it was shutdown during execution.

[justinc1]

Integ test: https://github.com/ScaleComputing/HyperCoreAnsibleCollection/actions/runs/5464904452 https://github.com/ScaleComputing/HyperCoreAnsibleCollection/actions/runs/5479912287

Edit: in 5479912287 failed vm_clone, looks like a bug. A failed virtual_disk_attach is likely not a bug in collection (but in test).

[justinc1]

Are the new vm__ and vm_disk__ tests not the same thing?

They are very similar, and both modules use same code from module_utils. But they are not exactly the same, so I added separate tests (and after doing this, I noticed vm_disk module does not correctly restart VMs).