INF-74 - Update chef versions on vagrant base boxes to support chef-solo environments

Strictly speaking chef 11.6.0 or greater is needed, but I updated to 11.8.0 to stay current, and bumped the chef 10 to 10.28.2.  I also stopped the auto-add so that a person could decide how to use locally.  And finally I uploaded the boxes to http://repo.sendgrid.net/ but with a fuller name so we can tell the difference from other boxes.