Updated openstack/openstack
Project: openstack/tempest  62bc947123643e87d9f0ac2425995573b2d7697a
null
fix sahara base class

1. get client mamager after service available checking
2. checking cls's attribute in tearDownClass to avoid
   exceptions

Change-Id: I596284dceadcb5f0144495bd346d570c6bb35e0f