Fix boot from volume tests to work with Mitaka
Fix boot from volume tests to work with Mitaka

[#127710961](https://www.pivotaltracker.com/story/show/127710961)

Signed-off-by: Tom Kiemes <2e6bc7bf64c2cabd57fd2be0c1baf57f97b6fecc@sap.com>

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