Better method of installing Chef by rpm

[tobami]

Now and then the rpm method of installing Chef is broken because of updated repos. The latest of this cases was #128.

@cburyta had an idea:

Here's another idea, (this seems to work well for the bento project,) use the installer at http://www.opscode.com/chef/install/. Rather than installing ruby and everything for just chef, maybe try the opscode rpm, installs only chef. I'll be testing this method more. It seems much more light weight, and the initial tests work for me, but still need to try more to see how it works long term.

(As seen here https://github.com/opscode/bento/blob/master/definitions/.common/chef-client.sh)

Note: this is taking a few steps out of just yum epel repo issue, but an idea about overall chef install and the required deps.)