Updated openstack/openstack
Project: openstack/tempest  3226ca1450f53ab7d6c94f2886968bc62ed851b7

If no volume, don't delete volume in teardown

If exception is thrown in setupClass before volume is created,
tearDownClass needn't delete volume.

Change-Id: I91c7eff8ec147b0ce3a9ea3e6c8d906ba68412c2
Closes-Bug: 1350167