Checkpoint of storage notifications.

Rewrite of storage notifications to support multiple disks/volumes,
handling the state of each independently.  Update strings to match
spec.  Include actions to jump into wizard when adoptable, otherwise
browse or eject.

Move browse intent creation to common place on VolumeInfo.  Also add
well-formed extra names.  VolumeInfo now carries the parent disk ID
along with it to avoid races when unmounting.

Bug: 19993667
Change-Id: I236ddc7f8112490355f438b828bec8d40c331fdd