[chef] Role Attributes yes or not?

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Hi, im starting with chef, and recently read a comment on a web, by adam 
jacob.
Talking about the roles and saying that you should only include attributes on
roles when it is absolutly unavoidable. 

Then i meet with the "sudo" cookbook saying that you have to use role
attributes.

So, just in order to start off on the right foot.

^^

Alberto Lorenzo.