Various changes to Device classes, esp. PartitionDevice.

- Fix some imports.
- Move setup methods to after setting
  self.exists to True in create methods. Doh!
- Generally prepend an underscore to names of
  methods that are intended only for use as
  property getter/setter.
- Don't call getFormat when initially defining
  StorageDevice._format since later in __init__
  we will set it via the format property, which
  will call getFormat.
- Create currentSize property to get actual size
  of a device, regardless of pending changes.
- Modify size property to reflect pending
  changes to size.
- Pass device's existence to base format ctor in
  _setFormat.
- Add a commit method to DiskDevice to commit
  pending changes.
- Use name instead of device in PartitionDevice
  ctor like we do in all the others.
- Lots of little fixes to access of
  parted.Partition data.
- Add methods to wrap parted.Partition flag ops.
- Add some flag setting to PartitionDevice.create
- Use lvs property in LVMVolumeGroupDevice's
  status method/property since it gets called
  from the ctor before we've set up lvNames.

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