Add Kitchen testsupport to magento cookbook

adds simple kitchen testsupport to magento cookbook

- installs ```magento::default``` into a virtualbox
- sets forwarding network ports ```80``` and ```443``` to ```808x``` and ```844x```` on host machine
- sets mysql passwortds to ```test```

Update:
- sets ```set_unless[:magento][:db][:password] = "magento"``` in kitchen.yml