Absolute Paths for Suite Data Bags, Roles, and Nodes are Set to Nil

I've found that when I place an absolute path for data bags, roles, or nodes in my .kitchen.yml file, it ends up being blank by the time the chef solo provisioner is run.  I've done hacked my local copy of test-kitchen and figured out that that it's getting set to nil the new_suite method at config.rb:77.  Commenting out the relevant entries in the path_hash is my current workaround but this is less than ideal.

Here is an example suite that shows the problem.

```
suites:
- name: default
  run_list: ["recipe[cookbook]"]
  data_bags_path: "/code/chef-data/data_bags"
  attributes: {}
```