Step: mkpart
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Create a partition.

Step keys:

* `mkpart` &mdash; REQUIRED; type of partition to create: use
  `primary` (but any value acceped by `parted` is OK).

* `device` &mdash; REQUIRED; filename of block device where to create
  partition.

* `start` &mdash; REQUIRED; where does the partition start?

* `end` &mdash; REQUIRED; where does the partition end?

* `tag` &mdash; REQUIRED; tag for the new partition.

Example (in the .vmdb file):

    - mkpart: primary
      device: "{{ output }}"
      start: 0%
      end: 100%
      tag: root
