Raise VolumeNotFound with correct volume_id

Make sure VolumeNotFound is raised with the correct volume_id
in the SolidFire driver. Some exceptions were wrongfully referring
to an undefined variable named uuid.

Fixes: bug #1182966
Change-Id: Ied101fc9778f51dfb74b39f466c2c13d6e775a40
Merge "Raise VolumeNotFound with correct volume_id" into stable/grizzly
Merge remote-tracking branch 'upstream/stable/grizzly' into stable/grizzly