Correct supermarket config file in product_matrix
Correct supermarket config file in product_matrix

As a user I would like to use `chef_ingredient` and setup my supermarket server passing my configuration through the `config` attribute so I don't have to use other methods like a `template` or `file` resources to lay down my configuration.

**Solution**

This commit modified the `product_matrix` pointing to the right `config-file` for supermarket that is `/etc/supermarket/supermarket.json` 

Closes https://github.com/chef-cookbooks/chef-ingredient/issues/30
vinyar/chef-ingredient,chef-cookbooks/chef-ingredient,surya85/devops,surya85/devops,GannettDigital/chef-ingredient,naumchenko/chef-ingredient,poliva83/chef-ingredient,surya85/devops,GannettDigital/chef-ingredient,surya85/devops,surya85/devops,surya85/devops,vinyar/chef-ingredient,surya85/devops,surya85/devops,chef-cookbooks/chef-ingredient,surya85/devops,surya85/devops