Update home-page in setup.cfg
Update home-page in setup.cfg

What is the problem?
The old home-page linked to http://www.openstack.org/, i think
it is not very proper. Home-page usually linked to the doc page, as
trove-dashboard does not have doc page, so i think it is proper to
change home-page to tove's doc page.

What is the solution to the problem?
Change home-page to http://docs.openstack.org/developer/trove/

Change-Id: I708a1f3ab0d131088c0197e1ef8c6cde76481125

openstack/trove-dashboard,openstack/trove-dashboard,openstack/trove-dashboard,openstack/trove-dashboard