Physical volumes for logical volumes

[langesven]

This change allows the use of physical_volume as argument to logical_volume so that the new lv will be created on a specific physical volume even if the volume group consists of several physical volumes.

Example:
Volume Group vg00 consists of 4 physical volumes:

  PV         VG   Fmt  Attr PSize PFree
  /dev/sda   vg00 lvm2 a--  1.09t    0 
  /dev/sdb   vg00 lvm2 a--  1.09t    0 
  /dev/sdc   vg00 lvm2 a--  1.09t    0 
  /dev/sdd   vg00 lvm2 a--  1.09t    0 

Some lvs can span all 4 pvs in a raid1/mirror setup for example:

  --- Logical volume ---
  LV Path                /dev/vg00/home
  LV Name                home
  VG Name                vg00
[...]
  Mirrored volumes       4
[...]
  --- Segments ---
  Logical extents 0 to 2559:
    Type                raid1

And other volumes can be created on one specific pv of the four that are part of vg00:

  --- Logical volume ---
  LV Path                /dev/vg00/data01
  LV Name                data01
  VG Name                vg00
[...]
  --- Segments ---
  Logical extents 0 to 270793:
    Type                linear
    Physical volume     /dev/sda

Example hiera code:

lvm::volume_groups:
  vg00:
    physical_volumes:
      - '/dev/sda'
      - '/dev/sdb'
      - '/dev/sdc'
      - '/dev/sdd'
    logical_volumes:
      home:
        size: 10GB
        fs_type: xfs
        mirror: 3
        type: raid1
      data01:
        size: ~
        mountpath: '/srv/data01'
        fs_type: xfs
        physical_volume: '/dev/sda'

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