Fix openstackclient spec test

Add openstackclient spec for init.

Change-Id: I7969c6bc7292fc616c64bbb381c218fb0acd78b2

spec/classes/watcher_init_spec.rb

@@ -9,6 +9,8 @@ describe 'watcher' do
         { :purge_config => false }
       end
 
+      it { should contain_class('openstacklib::openstackclient') }
+
       it 'contains the db class' do
         is_expected.to contain_class('watcher::db')
       end