Remove PyPI downloads
Remove PyPI downloads

According to official site,
https://packaging.python.org/guides/analyzing-pypi-package-downloads/
PyPI package download statistics is no longer maintained and thus
should be removed.

Change-Id: I36ad2c12e881149400c17174f56e8962df4c1aba

openstack/python-glanceclient,openstack/python-glanceclient