Fix integratins tests

- Use "site-cookbooks" instead of "cookbooks" as the latter can and will
  be nuked by Librarian and Berkshelf.

- Init kitchens without Berksfile or Cheffile so that they do not
  interfere when cookin.

Both fixes should be enough also alone, but together they should avoid
surprises in the future too.

Also add name attribute to "secret_cookbook".