Add support scripts for regenerating goiardia data

Goiardi changed the on-disk layout of data in the last build. This adds
`test/support/regen_data.sh` which will wipe out the data and re-populate
a goiardi server from the data stored in test/support/chef.

Requires the workstation have knife and Berkshelf3 installed to work right. (chefdk)
Merge pull request #26 from marpaia/regen_data

Add support scripts for regenerating goiardi data