Fix openstackclient spec test

Dont check things inside openstacklib but
check that the openstacklib class is there.

Change-Id: I2a2b3a2ff9ac02c2a276af03152676ce94c66ef8

spec/classes/cinder_client_spec.rb

@@ -26,13 +26,7 @@ describe 'cinder::client' do
       )
     end
 
-    it 'installs openstackclient package' do
-      is_expected.to contain_package('python-openstackclient').with(
-        'ensure' => 'present',
-        'tag'    => 'openstack',
-      )
-    end
-
+    it { should contain_class('openstacklib::openstackclient') }
   end
 
   on_supported_os({