Better error messages, new TK suites

[martinb3]

• Ensure we raise the original error when we see something unexpected. It's been very difficult to troubleshoot when you can't see the underlying error. We're still logging the original error text. Apparently in Ruby 2.1+, this is fixed because raise "foo" automatically chains to the previous exception. But we're not on that everywhere, so this is a better solution.
• .kitchen.yml was super old. Updated to some modern platforms.

[martinb3]

This will prevent entire error messages consisting of:

       ================================================================================
           Error executing action `add` on resource 'rackspacecloud_record[test-rax]'
           ================================================================================

           RuntimeError
       ------------
           Could not create DNS record: Fog::DNS::Rackspace::CallbackError

It's very hard to debug/diagnose those.