<!--- Verify first that your feature was not already discussed on GitHub -->
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##### SUMMARY
<!--- Describe the new feature/improvement briefly below -->
Currently it's not possible to specify disks to be included in the snapshot, always all disks are used.

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
ovirt_snapshot

##### ADDITIONAL INFORMATION
<!--- Describe how the feature would be used, why it is needed and what it would solve -->

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Could look like:
```yaml
ovirt_snapshot:
  description: My snap
  vm_name: myvm
  disks:
    - id: 123
    - id: 456
```

or 

```yaml
ovirt_snapshot:
  description: My snap
  vm_name: myvm
  disks:
    - name: myvm_disk_db
    - name: myvm_disk_store
```

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'changed': changed,
        'id': snapshot.id,
        'snapshot': get_dict_of_struct(snapshot),
    }
def remove_snapshot(module, vm_service, snapshots_service, snapshot_id=None):
    changed = False
    if not snapshot_id:
        snapshot_id = module.params['snapshot_id']
    snapshot = get_entity(
        snapshots_service.snapshot_service(snapshot_id)
    )
    if snapshot:
        snapshot_service = snapshots_service.snapshot_service(snapshot.id)
        if not module.check_mode:
            snapshot_service.remove()
        changed = True
        wait(
            service=snapshot_service,
            condition=lambda snapshot: snapshot is None,
            wait=module.params['wait'],
            timeout=module.params['timeout'],
        )
    return {
        'changed': changed,
        'id': snapshot.id if snapshot else None,
        'snapshot': get_dict_of_struct(snapshot),
    }
def restore_snapshot(module, vm_service, snapshots_service):
    changed = False
    snapshot_service = snapshots_service.snapshot_service(