Updated openstack/openstack
Project: openstack/tempest  1b58d3124e42d020faccb2e7d1e7419d3b924b43

javelin: Detach the volume before destruction

In Icehouse, a volume needs to be detached before it can be deleted.

Closes-Bug:  #1375476

Change-Id: Ic1c8e79fc1efa46ac9a70e288166cd5e0d823cfa