Step: mklabel
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Create a partition table on a block device.

Step keys:

* `mklabel` &mdash; REQUIRED; type of partition table, MUST be one of
  `msdos` and `gpt`.

* `device` &mdash; REQUIRED; tag for the block device.

Example (in the .vmdb file):

    - mklabel: msdos
      device: "{{ output }}"
