Pin to posgresql 2.5 module

- Later version breaks backward compatibility.
- Sort fixtures for better maintainability

Change-Id: I30ac98687b4f6cedf241746f32d7d57678e6adbb
fix stackforge web link

Change-Id: Ibf88b2796706d27e3e420eed18a69a5189041bac
Merge git://github.com/puppetlabs/puppetlabs-nova