Allow hiera to set metaparameters for a class

It would be cool if you could assign metaparameters with hiera. I discovered today that I was unable to use hiera to set the stage for my yum repo class, so in my profile, I had to use parameterized classes. Not the worst thing in the world, but it clashes with the idea of avoiding parameterized classes in favor of includes with automatic hiera lookup.

It was suggested to me that I could wrap the class in another class that takes a regular parameter from hiera, and then use that parameter to set the stage. Yuck.