Add virtual_disk_info module

[justinc1]

Module sample output is:

  sample:
    name: demo-virtual-disk
    block_size: 1048576
    size: 1073741824
    replication_factor: 2
    uuid: 7983b298-c37a-4c99-8dfe-b2952e81b092

size gets value from capacityBytes in API response. API field totalAllocationBytes is ignored, until it gets clear why it is equal to capacityBytes.

[justinc1]

Raw API response is like:

TASK [Show particular disk info] ***************************************************************
ok: [localhost] => 
  result.record[0]:
    blockSize: 1048576
    capacityBytes: 1073741824
    name: ci-test-virtual-disk-1.qcow2
    replicationFactor: 2
    totalAllocationBytes: 1073741824
    uuid: 55eec75d-008b-4f1f-af2d-054fbbb4a933

Can you agree about proposed virtual_disk_info module output:

    - name: List a single virtual disk
      scale_computing.hypercore.virtual_disk_info:
        name: "{{ image_filename }}"
      register: result
    - ansible.builtin.assert:
        that:
          - result is succeeded
          - result is changed
          - result.records | length == 1
          - result.records.0.block_size == 1048576
          - result.records.0.capacity_bytes == 1073741824
          - result.records.0.name == "{{ image_filename }}"
          - result.records.0.replication_factor == 2
          - result.records.0.total_allocation_bytes == 1073741824
          - result.records.0.uuid | len == 36

[domendobnikar]

capacityBytes is Total capacity, in bytes. totalAllocationBytes is Storage space in use, in bytes. blockSize is Size of individual blocks (the smallest unit of measurement for VSDs) on the drive, in bytes.

Do we want to rename any of these, or are these standard names that users can understand? total allocation vs capacity can be a bit misleading. Maybe => allocated capacity and total capacity or allocated size and total size to be more in line with vm_disk module ... we use size there instead of capacity I think.

[justinc1]

I decided to use size for capacityBytes, to be similar to vm_disk module.

The totalAllocationBytes - for now I will just remove it from output. I see totalAllocationBytes==capacityBytes, this is not what I would expect.

[justinc1]

Assigned also @PolonaM , because HyperCore version check will be used also in cluster_name module.