cleanup & refactor

Cleanup all the things. Major changes include:

*  <code>databases::postgresql</code> hates the way we install pg93, so hack around it
*  use yum_repository
*  use encrypted data bags
Do we have srpm's for the packages? I'd like to rebuild them, sign them and put them on our public repo on ftp.o.o. We may want to make a yum-osuosl repo cookbook too so we can use that publicaly. I'd like to eventually phase out the internal repo. But for now we can just include it directly in this cookbook.