Updated openstack/openstack
Project: openstack/oslo.db  c6ddb04eb19bbd82fbd8dc692de2bffea8223268

Fix the link to the bug reporting site

Update the README to fix the link to the bug reporting site and to
provide a slightly more detailed description of the library.

Change-Id: I8896297bd8d7a64c72e17c0d9a985cb35991e41d