Description of problem:
LVMThinPoolDevice is an instance of LVMLogicalVolumeDevice. I don't think that it should be like that. Thin pools are probably somewhere in between a volume group and a logical volume, but I don't think they are logical volumes. What would be LVMThinLogicalVolume then?


Version-Release number of selected component (if applicable):
python-blivet-0.22-1.fc21.noarch


Steps to Reproduce:
1. Have a thin pool present on your system.
2. Run the following code snippet
  import blivet
  b = blivet.Blivet()
  b.reset()
  tp = b.thinpools[0]
  print type(tp)
  # <class 'blivet.devices.LVMThinPoolDevice'>
  isinstance(tp, blivet.devices.LVMLogicalVolumeDevice)
  # True

Actual results:
LVMThinPoolDevice is an instance of LVMLogicalVolumeDevice


Expected results:
LVMThinPoolDevice is an instance of LVMVolumeGroupDevice? Not sure here.