Role 'Cinder LVM' is enabled for LVM or VMDK driver

Fix restriction for Cinder LVM role in openstack.yaml.

Change-Id: Iff6aea9b6d76afbf5333eeb6136564e2d28f2348
Closes-Bug: 1387636
Merge "Role 'Cinder LVM' is enabled for LVM or VMDK driver"