[COOK-3284] - Remove setuptools upgrade

Since `pip` was upgraded to be [compatible with the latest versions of `setuptools`](http://www.pip-installer.org/en/latest/news.html#id2) (0.7.6 and 1.0) the `setuptools` upgrade within the supervisor cookbook is no longer needed.

I've added a minitest to ensure the version of pip installed is the latest version, 1.4.1.