removed openstack/database-api from programs

With change I0111bcd38341b1736a47b0a3d3e6ff96d2ca1c58 the
database-api documention was merged into openstack/trove.

Change-Id: I8deb90828229e61cd2a38411d29e5e5e2f5cabd8
Merge "removed openstack/database-api from programs"