Updated openstack/openstack
Project: openstack/tempest  687a07ccf84561335e55ce0b8838088e097886fc
null
Add volume extensions tests

This commit adds clients for the cinder extensions api and adds
tests to list the extensions, which parallels the existing tests we
have for the nova equivalent api.

Change-Id: Ie24609ade3a4884b42f75ba6f3d3d969aca37505