[COOK-2231] Fix support for postgresql 9.x in server_redhat recipe

This was originally lumped into COOK-2051, so I agreed to break it out as a separate ticket.
I needed to make two changes to get the server_redhat recipe to work. These both seem to be inadvertent coding mistakes with commits in early November 2012. See my commits (or the COOK-2231 ticket) for details.