Audit Tests

* Adds some basic specs and instructions to run them to make sure the principles work.
* Fixes the existing specs.
* Added more meaningful values for config option since that will impact backwards compatibility.

Ready to run through CI but Jenkins is not happy. Will run through CI tomorrow and see if there is any extra failures.

/cc: @tyler-ball, @mcquin 
We're going to need to update the logic around https://github.com/opscode/chef/blob/tball/start-end-time/lib/chef/audit/audit_reporter.rb#L89-L91 when we all merge