Updated openstack/openstack
Project: openstack/tempest  cccc74ad79858ee4ce699051a5e6cbad9fb161ac

Add VolumeClient for cleanup

In volume clients, there is a lot of duplicated code for
setting CONF. This patch adds VolumeClient for removing them.

Change-Id: I4be9678656d0da5689070959c7f56c2ed903dd69