Revert "ensure `pip` does not call out to external servers"
Revert "ensure `pip` does not call out to external servers"

This reverts commit 3e15c0cd4897ee6df1b237e0d18ca274d5a2242c.

jimlindeman/python-buildpack-collectd,cloudfoundry/python-buildpack,gitricko/apt-python-buildpack,Nazanin84/python-buildpack,Nazanin84/python-buildpack,gitricko/apt-python-buildpack,Nazanin84/python-buildpack,pkumar-appd/python-buildpack,cloudfoundry/python-buildpack,pkumar-appd/python-buildpack,jimlindeman/python-buildpack-collectd,jimlindeman/python-buildpack-collectd,cloudfoundry/python-buildpack,gitricko/apt-python-buildpack,andrespires/python-buildpack,andrespires/python-buildpack,pkumar-appd/python-buildpack,andrespires/python-buildpack