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PyPI package download statistics is no longer maintained and thus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: Ifc075f2bf6d7288e8ee4813da33973d0b017998b

openstack/python-muranoclient,openstack/python-muranoclient