Fix homepage location.

Having PyPI point to itself is kinda silly.

Change-Id: I54c201c2a9f4bc0c871c04650e83ca419a77cb91
Reviewed-on: https://review.openstack.org/26561
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins