Adding volume_type configuration for Micro BOSH.
Updating to use the recommended persistent_disk_cloud_properties syntax.
Add tests for persistent_disk_cloud_properties

Signed-off-by: Zachary Auerbach <zauerbach@pivotal.io>
Update disk will now apply a new ebs type if size changes as well

Signed-off-by: Zachary Auerbach <zauerbach@pivotal.io>
Fix line too long violation

Signed-off-by: Zachary Auerbach <zauerbach@pivotal.io>