Cleanup no longer specifies volume API version 1
Cleanup no longer specifies volume API version 1

[#158068694](https://www.pivotaltracker.com/story/show/158068694)

cloudfoundry-incubator/bosh-openstack-cpi-release,cloudfoundry-incubator/bosh-openstack-cpi-release,cloudfoundry-incubator/bosh-openstack-cpi-release