21788 - Ability to retrieve multiple facts through rpcutil

This commit adds the get_facts action to the rpcutil agent. This action
accepts a comma-separated list of fact names and returns a hash
containing fact => value for all supplied facts.
21788 - Ability to retrieve multiple facts through rpcutil

This commit adds tests for the get_facts action added to rpcutil.
Merge pull request #115 from ploubser/feature/master/21788

21788 - Ability to retrieve multiple facts through rpcutil

Closes #98