Set the pypiserver root to the correct directory
The folder from which pypiserver will serve the wheels that are
pre-built in the repo-build process was incorrectly set, resulting
in pypiserver never, ever serving the wheels but instead always
forwarding on to the nginx reverse proxy to fetch things from
Now that the root folder is correctly set, two things will happen:
* Wheels will be served from pypi, negating the need to use the
pip_links, so  should pass once this merges.
* Once the repo build is complete, the packages available to
install will be restricted properly to only the packages
built by the repo build process.