Modules rally.plugins.openstack.context.cleanup.manager and
rally.plugins.openstack.context.cleanup.resources were deprecated in
previous release and we ready to remove them, since the produce a lot of
redundant warning messages.
__init__ module should be empty, so code from
rally.plugins.openstack.context.cleanup.__init__ moves to
-> rally.plugins.openstack.context.cleanup.admin (AdminCleanup)
-> rally.plugins.openstack.context.cleanup.user (UserCleanup)
-> rally.plugins.openstack.context.cleanup.base (base stuff)
Also tests.unit.plugins.openstack.context.test_cleanup is refactored too.
Change-Id: I25cf5750cb2de0d5652dc44db75818a5e10626eb
1bd254228d