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: Ic9fc8364ecc3cb430357213c573cd0a584c894c9

openstack/oslo.versionedobjects