nfs-utils installed for cinder, multi -> single backend transition fix

Well i'm not sure... The problem with puppet is that it only allows one definition of package of given name per the whole deployment, so i wonder if it would be problematic to have puppet-cinder take responsibility of defining package { 'nfs-utils' }. If puppet-glance wanted to do the same (it can also use nfs as a backend afaik), i think it would result in an error.

I googled that "virtual resources" might be the solution here but don't have bandwidth now to dig deeper:

http://serverfault.com/questions/486455/why-puppet-can-require-each-package-just-once