Updated openstack/openstack
Project: openstack/tempest  59a41ebc900f3e6b75592ecd9efefa9b37442c4c
null
Fix services decorator to use object_storage

Previously the services decorator used the keyword object to denote that
the test would use swift. However, everywhere else object_storage is used.
This commit makes the usage consistent by switching it to object_storage.

Change-Id: I69edf44a9b3b731616f1faeb240a691a187df845