Trivial: Update pypi url to new url
Trivial: Update pypi url to new url

Pypi url changed from [1] to [2]

[1] https://pypi.python.org/pypi/<package>
[2] https://pypi.org/project/<package>

Change-Id: Ie8b29b4171dcc833a9178a80ba6d277a2bf3a747

openstack/oslo.db,openstack/oslo.db