Updated openstack/openstack
Project: openstack/tempest  770b872ff6b25ef082a468240bb57ec478358513

Add ObjectStorageClient for cleanup

In object storage clients, there is a lot of duplicated code for
setting CONF. This patch adds ObjectStorageClient for removing them.

Change-Id: I07eb4af34b20ae94a09b6fa90ffeb3bc19e14762