Changed the home-page of nova-specs in setup.cfg

Instead of pointing to openstack.org, the homepage has been
changed to point to the homepage of nova-specs.

Change-Id: I8c94bd84dc8867c91e5e5958ff6f7c9bbd475310

setup.cfg

@@ -5,7 +5,7 @@ description-file =
     README.rst
 author = OpenStack
 author-email = openstack-dev@lists.openstack.org
-home-page = http://www.openstack.org/
+home-page = http://specs.openstack.org/openstack/nova-specs/
 classifier =
     Intended Audience :: Developers
     License :: OSI Approved :: Apache Software License