Step: `vgcreate`
-----------------------------------------------------------------------------

Create an LVM2 volume group (VG), and also initialise the physical
volumes for it.


Step keys:

* `vgcreate` &mdash; REQUIRED; value is the tag for the volume group.
  This gets initialised with `vgcreate`.

* `physical` &mdash; REQUIRED; list of tags for block devices
  (partitions) to use as physical volumes. These get initialised with
  `pvcreate`.

Example (in the .vmdb file):

    - vgcreate: rootvg
      physical:
      - my_partition
      - other_partition


Step: `lvcreate`
-----------------------------------------------------------------------------

Create an LVM2 logical volume (LV) in an existing volume group.

Step keys:

* `lvcreate` &mdash; REQUIRED; value is the tag for the volume group.

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

* `size` &mdash; REQUIRED; size of the new LV.

Example (in the .vmdb file):

    - lvcreate: rootvg
      name: rootfs
      size: 1G
