<!--- 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 -->

<!--- Paste example playbooks or commands between quotes below -->
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
```

<!--- HINT: You can also paste gist.github.com links for larger files -->

snapshot_id: "{{ snapshot.id }}"
# Upload local image to disk and attach it to vm:
# Since Ansible 2.8
- ovirt_snapshot:
    name: mydisk
    vm_name: myvm
    upload_image_path: /path/to/mydisk.qcow2
# Download snapshot to local file system:
# Since Ansible 2.8
- ovirt_snapshot:
    snapshot_id: 7de90f31-222c-436c-a1ca-7e655bd5b60c
    disk_name: DiskName
    vm_name: myvm
    download_image_path: /home/user/mysnaphost.qcow2
# Delete all snapshots older than 2 days
- ovirt_snapshot:
    vm_name: test
    keep_days_old: 2
'''
RETURN = '''
id:
    description: ID of the snapshot which is managed
    returned: On success if snapshot is found.
    type: str
    sample: 7de90f31-222c-436c-a1ca-7e655bd5b60c
snapshot:
    description: "Dictionary of all the snapshot attributes. Snapshot attributes can be found on your oVirt/RHV instance
                  at following url: http://ovirt.github.io/ovirt-engine-api-model/master/#types/snapshot."
    returned: On success if snapshot is found.
    type: dict