Remove barbican from being used and update cinder_volume_group

In favor of moving to encrypt the file-backed cinder image, remove
all front-facing aspects to barbican and update cinder_volume_group.

This is primarily echohead's commit...just some rework by Dewey and
myself.
Merge pull request #190 from blueboxgroup/lvm-encrypt2

Remove barbican from being used and update cinder_volume_group