Update tests to reflect changes to including playbooks using with_items

Commit 290780d13f changed behaviour so that using with_items in
conjunction with playbook inclusion no longer has an effect

This changes the results of running playbook-includer.yml from 10 oks to 6 oks, causing the TestPlayBook:test_includes to fail. This fixes that test. 

I have also updated the playbook to note that the with_items no longer
has an effect