Split some VolumeInfo state into VolumeRecord.

VolumeRecord is a historical record of a volume that we've seen in
the past.  It's now surfaced outside the framework for SystemUI to
drive the notifications that bug users to reinsert missing private
volumes.

Show progress notifications for both storage and package movement
operations.  Notify when an empty disk is inserted (no usable volumes)
which launches into the normal format flow.

Add API to forget volumes.

Bug: 20275424, 20275424
Change-Id: I75602c17fdcd4d1f1f62324e1a08c4a33093eefa